Follow along with the video below to see how to install our site as a web app on your home screen.
Note: This feature may not be available in some browsers.
jlarkin@highlandsniptechnology.com wrote:
On Mon, 15 Aug 2022 18:26:44 -0000 (UTC), Cydrome Leader
presence@MUNGEpanix.com> wrote:
jlarkin@highlandsniptechnology.com wrote:
On Sun, 14 Aug 2022 15:12:04 -0700 (PDT), John Walliker
jrwalliker@gmail.com> wrote:
On Friday, 12 August 2022 at 19:24:32 UTC+1, Cydrome Leader wrote:
Joe Gwinn <joeg...@comcast.net> wrote:
On Fri, 12 Aug 2022 04:40:54 -0000 (UTC), Cydrome Leader
pres...@MUNGEpanix.com> wrote:
John Larkin <jjla...@highlandtechnology.com> wrote:
On Thu, 11 Aug 2022 16:38:38 -0700, John Larkin
jjla...@highlandtechnology.com> wrote:
What\'s a good way to measure the negative diopter of my glasses, given
minimal tools up the the cabin?
I can let the sun shine through a lens and see an enlarged circle on
the ground a few feet away. What\'s the math on that?
I found it online.
https://physics.stackexchange.com/questions/566207/how-to-measure-the-strength-of-a-prescription-eyeglass-lens
My lens is 2\" wide and sunlight projects a 4\" wide image at 11\" from a
screen. So the fl of the lens is -11\".
That\'s bad, since that eye focuses at about 17\". These glasses are
over-correcting.
You\'re pulling some weird NASA moves by asking \"what\'s the diopter of a
lense\" and then concluding a focal length of -11 inches.
Nothing weird here. Just some simple optics.
It is weird. He\'s going on about diopters, but they\'re not a part of
either known or unknowns in what he\'s trying to calculate or confirm.
Well, the diopter is just the reciprocal of the focal length in metres, so
it is relevant. Opticians use diopters because lenses can be stacked
in front of each other and the powers in diopters simply add or subtract
as appropriate. This is much easier than working directly with focal lengths.
It\'s just like resistors in parallel.
When is the last time you use mhos in a calcuation?
I type
rval
1/x
(RPN) often. I don\'t call them mhos; they are actually Siemens.
What resistor do you put across 5 ohms to get 3 ohms?
3
1/x
5
1/x
-
1/x
Seems like the answer is never. I see lots of repetetive 1 over
calculations.
There really is no going back once you learn RPN. Even a fancy calculator
where you can see rows of nested braces just doesn\'t compare.
I always though mhos were just odd. So when did you last use susceptance,
in siemens of course? Maybe it\'s time to hawk special \"ultra high
susceptance\" cables to the audiophiles.
On 2022-08-16 23:06, Cydrome Leader wrote:
jlarkin@highlandsniptechnology.com wrote:
On Mon, 15 Aug 2022 18:26:44 -0000 (UTC), Cydrome Leader
presence@MUNGEpanix.com> wrote:
jlarkin@highlandsniptechnology.com wrote:
On Sun, 14 Aug 2022 15:12:04 -0700 (PDT), John Walliker
jrwalliker@gmail.com> wrote:
On Friday, 12 August 2022 at 19:24:32 UTC+1, Cydrome Leader wrote:
Joe Gwinn <joeg...@comcast.net> wrote:
On Fri, 12 Aug 2022 04:40:54 -0000 (UTC), Cydrome Leader
pres...@MUNGEpanix.com> wrote:
John Larkin <jjla...@highlandtechnology.com> wrote:
On Thu, 11 Aug 2022 16:38:38 -0700, John Larkin
jjla...@highlandtechnology.com> wrote:
What\'s a good way to measure the negative diopter of my glasses, given
minimal tools up the the cabin?
I can let the sun shine through a lens and see an enlarged circle on
the ground a few feet away. What\'s the math on that?
I found it online.
https://physics.stackexchange.com/questions/566207/how-to-measure-the-strength-of-a-prescription-eyeglass-lens
My lens is 2\" wide and sunlight projects a 4\" wide image at 11\" from a
screen. So the fl of the lens is -11\".
That\'s bad, since that eye focuses at about 17\". These glasses are
over-correcting.
You\'re pulling some weird NASA moves by asking \"what\'s the diopter of a
lense\" and then concluding a focal length of -11 inches.
Nothing weird here. Just some simple optics.
It is weird. He\'s going on about diopters, but they\'re not a part of
either known or unknowns in what he\'s trying to calculate or confirm.
Well, the diopter is just the reciprocal of the focal length in metres, so
it is relevant. Opticians use diopters because lenses can be stacked
in front of each other and the powers in diopters simply add or subtract
as appropriate. This is much easier than working directly with focal lengths.
It\'s just like resistors in parallel.
When is the last time you use mhos in a calcuation?
I type
rval
1/x
(RPN) often. I don\'t call them mhos; they are actually Siemens.
What resistor do you put across 5 ohms to get 3 ohms?
3
1/x
5
1/x
-
1/x
Seems like the answer is never. I see lots of repetetive 1 over
calculations.
There really is no going back once you learn RPN. Even a fancy calculator
where you can see rows of nested braces just doesn\'t compare.
I always though mhos were just odd. So when did you last use susceptance,
in siemens of course? Maybe it\'s time to hawk special \"ultra high
susceptance\" cables to the audiophiles.
Conductance, susceptance, admittance, they have their uses. In the
design of matching networks, filters and pulse forming networks, it\'s
common to switch back and forth between those and their reciprocals
all the time.
Jeroen Belleman
On Tue, 16 Aug 2022 21:06:12 -0000 (UTC), Cydrome Leader
presence@MUNGEpanix.com> wrote:
jlarkin@highlandsniptechnology.com wrote:
On Mon, 15 Aug 2022 18:26:44 -0000 (UTC), Cydrome Leader
presence@MUNGEpanix.com> wrote:
jlarkin@highlandsniptechnology.com wrote:
On Sun, 14 Aug 2022 15:12:04 -0700 (PDT), John Walliker
jrwalliker@gmail.com> wrote:
On Friday, 12 August 2022 at 19:24:32 UTC+1, Cydrome Leader wrote:
Joe Gwinn <joeg...@comcast.net> wrote:
On Fri, 12 Aug 2022 04:40:54 -0000 (UTC), Cydrome Leader
pres...@MUNGEpanix.com> wrote:
John Larkin <jjla...@highlandtechnology.com> wrote:
On Thu, 11 Aug 2022 16:38:38 -0700, John Larkin
jjla...@highlandtechnology.com> wrote:
What\'s a good way to measure the negative diopter of my glasses, given
minimal tools up the the cabin?
I can let the sun shine through a lens and see an enlarged circle on
the ground a few feet away. What\'s the math on that?
I found it online.
https://physics.stackexchange.com/questions/566207/how-to-measure-the-strength-of-a-prescription-eyeglass-lens
My lens is 2\" wide and sunlight projects a 4\" wide image at 11\" from a
screen. So the fl of the lens is -11\".
That\'s bad, since that eye focuses at about 17\". These glasses are
over-correcting.
You\'re pulling some weird NASA moves by asking \"what\'s the diopter of a
lense\" and then concluding a focal length of -11 inches.
Nothing weird here. Just some simple optics.
It is weird. He\'s going on about diopters, but they\'re not a part of
either known or unknowns in what he\'s trying to calculate or confirm.
Well, the diopter is just the reciprocal of the focal length in metres, so
it is relevant. Opticians use diopters because lenses can be stacked
in front of each other and the powers in diopters simply add or subtract
as appropriate. This is much easier than working directly with focal lengths.
It\'s just like resistors in parallel.
When is the last time you use mhos in a calcuation?
I type
rval
1/x
(RPN) often. I don\'t call them mhos; they are actually Siemens.
What resistor do you put across 5 ohms to get 3 ohms?
3
1/x
5
1/x
-
1/x
Seems like the answer is never. I see lots of repetetive 1 over
calculations.
There really is no going back once you learn RPN. Even a fancy calculator
where you can see rows of nested braces just doesn\'t compare.
I always though mhos were just odd. So when did you last use susceptance,
in siemens of course? Maybe it\'s time to hawk special \"ultra high
susceptance\" cables to the audiophiles.
I have an app on my Android phone, Free42, which looks and feels a lot
like a classic HP calculator. Very nice.
Are kids learning RPN these days?
John Larkin <jlarkin@highland_atwork_technology.com> wrote:
On Tue, 16 Aug 2022 21:06:12 -0000 (UTC), Cydrome Leader
presence@MUNGEpanix.com> wrote:
jlarkin@highlandsniptechnology.com wrote:
On Mon, 15 Aug 2022 18:26:44 -0000 (UTC), Cydrome Leader
presence@MUNGEpanix.com> wrote:
jlarkin@highlandsniptechnology.com wrote:
On Sun, 14 Aug 2022 15:12:04 -0700 (PDT), John Walliker
jrwalliker@gmail.com> wrote:
On Friday, 12 August 2022 at 19:24:32 UTC+1, Cydrome Leader wrote:
Joe Gwinn <joeg...@comcast.net> wrote:
On Fri, 12 Aug 2022 04:40:54 -0000 (UTC), Cydrome Leader
pres...@MUNGEpanix.com> wrote:
John Larkin <jjla...@highlandtechnology.com> wrote:
On Thu, 11 Aug 2022 16:38:38 -0700, John Larkin
jjla...@highlandtechnology.com> wrote:
What\'s a good way to measure the negative diopter of my glasses, given
minimal tools up the the cabin?
I can let the sun shine through a lens and see an enlarged circle on
the ground a few feet away. What\'s the math on that?
I found it online.
https://physics.stackexchange.com/questions/566207/how-to-measure-the-strength-of-a-prescription-eyeglass-lens
My lens is 2\" wide and sunlight projects a 4\" wide image at 11\" from a
screen. So the fl of the lens is -11\".
That\'s bad, since that eye focuses at about 17\". These glasses are
over-correcting.
You\'re pulling some weird NASA moves by asking \"what\'s the diopter of a
lense\" and then concluding a focal length of -11 inches.
Nothing weird here. Just some simple optics.
It is weird. He\'s going on about diopters, but they\'re not a part of
either known or unknowns in what he\'s trying to calculate or confirm.
Well, the diopter is just the reciprocal of the focal length in metres, so
it is relevant. Opticians use diopters because lenses can be stacked
in front of each other and the powers in diopters simply add or subtract
as appropriate. This is much easier than working directly with focal lengths.
It\'s just like resistors in parallel.
When is the last time you use mhos in a calcuation?
I type
rval
1/x
(RPN) often. I don\'t call them mhos; they are actually Siemens.
What resistor do you put across 5 ohms to get 3 ohms?
3
1/x
5
1/x
-
1/x
Seems like the answer is never. I see lots of repetetive 1 over
calculations.
There really is no going back once you learn RPN. Even a fancy calculator
where you can see rows of nested braces just doesn\'t compare.
I always though mhos were just odd. So when did you last use susceptance,
in siemens of course? Maybe it\'s time to hawk special \"ultra high
susceptance\" cables to the audiophiles.
I have an app on my Android phone, Free42, which looks and feels a lot
like a classic HP calculator. Very nice.
Are kids learning RPN these days?
Not directly. They push python as a programming language, and it\'s real
backwards, but no official RPN classes anywhere. TI still runs the
cartel for school approved graphing calculators.
I\'m not even sure what they teach these days that offers any real value
outside of constantly taking tests ina school, and learning how to be meek
and offended by everything.
Was chatting with a machinist who say they regularly have people apply for
assembly jobs at the factory and can\'t even use a socket wrench. They pass
on those folks. People are so helpless fewer and fewer cars even come with
a spare, as they know the driver won\'t be able to change it in the first
place. Sad times.
Jeroen Belleman <jeroen@nospam.please> wrote:
On 2022-08-16 23:06, Cydrome Leader wrote:
jlarkin@highlandsniptechnology.com wrote:
On Mon, 15 Aug 2022 18:26:44 -0000 (UTC), Cydrome Leader
presence@MUNGEpanix.com> wrote:
jlarkin@highlandsniptechnology.com wrote:
On Sun, 14 Aug 2022 15:12:04 -0700 (PDT), John Walliker
jrwalliker@gmail.com> wrote:
On Friday, 12 August 2022 at 19:24:32 UTC+1, Cydrome Leader wrote:
Joe Gwinn <joeg...@comcast.net> wrote:
On Fri, 12 Aug 2022 04:40:54 -0000 (UTC), Cydrome Leader
pres...@MUNGEpanix.com> wrote:
John Larkin <jjla...@highlandtechnology.com> wrote:
On Thu, 11 Aug 2022 16:38:38 -0700, John Larkin
jjla...@highlandtechnology.com> wrote:
What\'s a good way to measure the negative diopter of my glasses, given
minimal tools up the the cabin?
I can let the sun shine through a lens and see an enlarged circle on
the ground a few feet away. What\'s the math on that?
I found it online.
https://physics.stackexchange.com/questions/566207/how-to-measure-the-strength-of-a-prescription-eyeglass-lens
My lens is 2\" wide and sunlight projects a 4\" wide image at 11\" from a
screen. So the fl of the lens is -11\".
That\'s bad, since that eye focuses at about 17\". These glasses are
over-correcting.
You\'re pulling some weird NASA moves by asking \"what\'s the diopter of a
lense\" and then concluding a focal length of -11 inches.
Nothing weird here. Just some simple optics.
It is weird. He\'s going on about diopters, but they\'re not a part of
either known or unknowns in what he\'s trying to calculate or confirm.
Well, the diopter is just the reciprocal of the focal length in metres, so
it is relevant. Opticians use diopters because lenses can be stacked
in front of each other and the powers in diopters simply add or subtract
as appropriate. This is much easier than working directly with focal lengths.
It\'s just like resistors in parallel.
When is the last time you use mhos in a calcuation?
I type
rval
1/x
(RPN) often. I don\'t call them mhos; they are actually Siemens.
What resistor do you put across 5 ohms to get 3 ohms?
3
1/x
5
1/x
-
1/x
Seems like the answer is never. I see lots of repetetive 1 over
calculations.
There really is no going back once you learn RPN. Even a fancy calculator
where you can see rows of nested braces just doesn\'t compare.
I always though mhos were just odd. So when did you last use susceptance,
in siemens of course? Maybe it\'s time to hawk special \"ultra high
susceptance\" cables to the audiophiles.
Conductance, susceptance, admittance, they have their uses. In the
design of matching networks, filters and pulse forming networks, it\'s
common to switch back and forth between those and their reciprocals
all the time.
Jeroen Belleman
Do you have an example? I\'m just curious. Say you\'re making a 2 stage type
E network, where do the weird units come into play?
On 2022-08-16 23:06, Cydrome Leader wrote:
jlarkin@highlandsniptechnology.com wrote:
On Mon, 15 Aug 2022 18:26:44 -0000 (UTC), Cydrome Leader
presence@MUNGEpanix.com> wrote:
jlarkin@highlandsniptechnology.com wrote:
On Sun, 14 Aug 2022 15:12:04 -0700 (PDT), John Walliker
jrwalliker@gmail.com> wrote:
On Friday, 12 August 2022 at 19:24:32 UTC+1, Cydrome Leader wrote:
Joe Gwinn <joeg...@comcast.net> wrote:
On Fri, 12 Aug 2022 04:40:54 -0000 (UTC), Cydrome Leader
pres...@MUNGEpanix.com> wrote:
John Larkin <jjla...@highlandtechnology.com> wrote:
On Thu, 11 Aug 2022 16:38:38 -0700, John Larkin
jjla...@highlandtechnology.com> wrote:
What\'s a good way to measure the negative diopter of my
glasses, given
minimal tools up the the cabin?
I can let the sun shine through a lens and see an enlarged
circle on
the ground a few feet away. What\'s the math on that?
I found it online.
https://physics.stackexchange.com/questions/566207/how-to-measure-the-strength-of-a-prescription-eyeglass-lens
My lens is 2\" wide and sunlight projects a 4\" wide image at
11\" from a
screen. So the fl of the lens is -11\".
That\'s bad, since that eye focuses at about 17\". These glasses
are
over-correcting.
You\'re pulling some weird NASA moves by asking \"what\'s the
diopter of a
lense\" and then concluding a focal length of -11 inches.
Nothing weird here. Just some simple optics.
It is weird. He\'s going on about diopters, but they\'re not a part of
either known or unknowns in what he\'s trying to calculate or
confirm.
Well, the diopter is just the reciprocal of the focal length in
metres, so
it is relevant. Opticians use diopters because lenses can be stacked
in front of each other and the powers in diopters simply add or
subtract
as appropriate. This is much easier than working directly with
focal lengths.
It\'s just like resistors in parallel.
When is the last time you use mhos in a calcuation?
I type
rval
1/x
(RPN) often. I don\'t call them mhos; they are actually Siemens.
What resistor do you put across 5 ohms to get 3 ohms?
3
1/x
5
1/x
-
1/x
Seems like the answer is never. I see lots of repetetive 1 over
calculations.
There really is no going back once you learn RPN. Even a fancy calculator
where you can see rows of nested braces just doesn\'t compare.
I always though mhos were just odd. So when did you last use susceptance,
in siemens of course? Maybe it\'s time to hawk special \"ultra high
susceptance\" cables to the audiophiles.
Conductance, susceptance, admittance, they have their uses. In the
design of matching networks, filters and pulse forming networks, it\'s
common to switch back and forth between those and their reciprocals
all the time.
Jeroen Belleman
On Wed, 17 Aug 2022 04:12:52 -0000 (UTC), Cydrome Leader
presence@MUNGEpanix.com> wrote:
John Larkin <jlarkin@highland_atwork_technology.com> wrote:
On Tue, 16 Aug 2022 21:06:12 -0000 (UTC), Cydrome Leader
presence@MUNGEpanix.com> wrote:
jlarkin@highlandsniptechnology.com wrote:
On Mon, 15 Aug 2022 18:26:44 -0000 (UTC), Cydrome Leader
presence@MUNGEpanix.com> wrote:
jlarkin@highlandsniptechnology.com wrote:
On Sun, 14 Aug 2022 15:12:04 -0700 (PDT), John Walliker
jrwalliker@gmail.com> wrote:
On Friday, 12 August 2022 at 19:24:32 UTC+1, Cydrome Leader wrote:
Joe Gwinn <joeg...@comcast.net> wrote:
On Fri, 12 Aug 2022 04:40:54 -0000 (UTC), Cydrome Leader
pres...@MUNGEpanix.com> wrote:
John Larkin <jjla...@highlandtechnology.com> wrote:
On Thu, 11 Aug 2022 16:38:38 -0700, John Larkin
jjla...@highlandtechnology.com> wrote:
What\'s a good way to measure the negative diopter of my glasses, given
minimal tools up the the cabin?
I can let the sun shine through a lens and see an enlarged circle on
the ground a few feet away. What\'s the math on that?
I found it online.
https://physics.stackexchange.com/questions/566207/how-to-measure-the-strength-of-a-prescription-eyeglass-lens
My lens is 2\" wide and sunlight projects a 4\" wide image at 11\" from a
screen. So the fl of the lens is -11\".
That\'s bad, since that eye focuses at about 17\". These glasses are
over-correcting.
You\'re pulling some weird NASA moves by asking \"what\'s the diopter of a
lense\" and then concluding a focal length of -11 inches.
Nothing weird here. Just some simple optics.
It is weird. He\'s going on about diopters, but they\'re not a part of
either known or unknowns in what he\'s trying to calculate or confirm.
Well, the diopter is just the reciprocal of the focal length in metres, so
it is relevant. Opticians use diopters because lenses can be stacked
in front of each other and the powers in diopters simply add or subtract
as appropriate. This is much easier than working directly with focal lengths.
It\'s just like resistors in parallel.
When is the last time you use mhos in a calcuation?
I type
rval
1/x
(RPN) often. I don\'t call them mhos; they are actually Siemens.
What resistor do you put across 5 ohms to get 3 ohms?
3
1/x
5
1/x
-
1/x
Seems like the answer is never. I see lots of repetetive 1 over
calculations.
There really is no going back once you learn RPN. Even a fancy calculator
where you can see rows of nested braces just doesn\'t compare.
I always though mhos were just odd. So when did you last use susceptance,
in siemens of course? Maybe it\'s time to hawk special \"ultra high
susceptance\" cables to the audiophiles.
I have an app on my Android phone, Free42, which looks and feels a lot
like a classic HP calculator. Very nice.
Are kids learning RPN these days?
Not directly. They push python as a programming language, and it\'s real
backwards, but no official RPN classes anywhere. TI still runs the
cartel for school approved graphing calculators.
I\'m not even sure what they teach these days that offers any real value
outside of constantly taking tests ina school, and learning how to be meek
and offended by everything.
Was chatting with a machinist who say they regularly have people apply for
assembly jobs at the factory and can\'t even use a socket wrench. They pass
on those folks. People are so helpless fewer and fewer cars even come with
a spare, as they know the driver won\'t be able to change it in the first
place. Sad times.
I have a relative who has a PhD in Engineering Mechanics. He is hugely
offended if anyone calls him a mechanical engineer. He\'s helpless at
fixing things.
John Larkin <jlarkin@highland_atwork_technology.com> wrote:
On Tue, 16 Aug 2022 21:06:12 -0000 (UTC), Cydrome Leader
pres...@MUNGEpanix.com> wrote:
jla...@highlandsniptechnology.com wrote:
On Mon, 15 Aug 2022 18:26:44 -0000 (UTC), Cydrome Leader
pres...@MUNGEpanix.com> wrote:
jla...@highlandsniptechnology.com wrote:
On Sun, 14 Aug 2022 15:12:04 -0700 (PDT), John Walliker
jrwal...@gmail.com> wrote:
On Friday, 12 August 2022 at 19:24:32 UTC+1, Cydrome Leader wrote:
Joe Gwinn <joeg...@comcast.net> wrote:
On Fri, 12 Aug 2022 04:40:54 -0000 (UTC), Cydrome Leader
pres...@MUNGEpanix.com> wrote:
John Larkin <jjla...@highlandtechnology.com> wrote:
On Thu, 11 Aug 2022 16:38:38 -0700, John Larkin
jjla...@highlandtechnology.com> wrote:
What\'s a good way to measure the negative diopter of my glasses, given
minimal tools up the the cabin?
I can let the sun shine through a lens and see an enlarged circle on
the ground a few feet away. What\'s the math on that?
I found it online.
https://physics.stackexchange.com/questions/566207/how-to-measure-the-strength-of-a-prescription-eyeglass-lens
My lens is 2\" wide and sunlight projects a 4\" wide image at 11\" from a
screen. So the fl of the lens is -11\".
That\'s bad, since that eye focuses at about 17\". These glasses are
over-correcting.
You\'re pulling some weird NASA moves by asking \"what\'s the diopter of a
lense\" and then concluding a focal length of -11 inches.
Nothing weird here. Just some simple optics.
It is weird. He\'s going on about diopters, but they\'re not a part of
either known or unknowns in what he\'s trying to calculate or confirm.
Well, the diopter is just the reciprocal of the focal length in metres, so
it is relevant. Opticians use diopters because lenses can be stacked
in front of each other and the powers in diopters simply add or subtract
as appropriate. This is much easier than working directly with focal lengths.
It\'s just like resistors in parallel.
When is the last time you use mhos in a calcuation?
I type
rval
1/x
(RPN) often. I don\'t call them mhos; they are actually Siemens.
What resistor do you put across 5 ohms to get 3 ohms?
3
1/x
5
1/x
-
1/x
Seems like the answer is never. I see lots of repetetive 1 over
calculations.
There really is no going back once you learn RPN. Even a fancy calculator
where you can see rows of nested braces just doesn\'t compare.
I always though mhos were just odd. So when did you last use susceptance,
in siemens of course? Maybe it\'s time to hawk special \"ultra high
susceptance\" cables to the audiophiles.
I have an app on my Android phone, Free42, which looks and feels a lot
like a classic HP calculator. Very nice.
Are kids learning RPN these days?
Not directly. They push python as a programming language, and it\'s real
backwards, but no official RPN classes anywhere. TI still runs the
cartel for school approved graphing calculators.
I\'m not even sure what they teach these days that offers any real value
outside of constantly taking tests ina school, and learning how to be meek
and offended by everything.
Was chatting with a machinist who say they regularly have people apply for
assembly jobs at the factory and can\'t even use a socket wrench. They pass
on those folks. People are so helpless fewer and fewer cars even come with
a spare, as they know the driver won\'t be able to change it in the first
place. Sad times.
onsdag den 17. august 2022 kl. 06.12.59 UTC+2 skrev Cydrome Leader:
John Larkin <jlarkin@highland_atwork_technology.com> wrote:
On Tue, 16 Aug 2022 21:06:12 -0000 (UTC), Cydrome Leader
pres...@MUNGEpanix.com> wrote:
jla...@highlandsniptechnology.com wrote:
On Mon, 15 Aug 2022 18:26:44 -0000 (UTC), Cydrome Leader
pres...@MUNGEpanix.com> wrote:
jla...@highlandsniptechnology.com wrote:
On Sun, 14 Aug 2022 15:12:04 -0700 (PDT), John Walliker
jrwal...@gmail.com> wrote:
On Friday, 12 August 2022 at 19:24:32 UTC+1, Cydrome Leader wrote:
Joe Gwinn <joeg...@comcast.net> wrote:
On Fri, 12 Aug 2022 04:40:54 -0000 (UTC), Cydrome Leader
pres...@MUNGEpanix.com> wrote:
John Larkin <jjla...@highlandtechnology.com> wrote:
On Thu, 11 Aug 2022 16:38:38 -0700, John Larkin
jjla...@highlandtechnology.com> wrote:
What\'s a good way to measure the negative diopter of my glasses, given
minimal tools up the the cabin?
I can let the sun shine through a lens and see an enlarged circle on
the ground a few feet away. What\'s the math on that?
I found it online.
https://physics.stackexchange.com/questions/566207/how-to-measure-the-strength-of-a-prescription-eyeglass-lens
My lens is 2\" wide and sunlight projects a 4\" wide image at 11\" from a
screen. So the fl of the lens is -11\".
That\'s bad, since that eye focuses at about 17\". These glasses are
over-correcting.
You\'re pulling some weird NASA moves by asking \"what\'s the diopter of a
lense\" and then concluding a focal length of -11 inches.
Nothing weird here. Just some simple optics.
It is weird. He\'s going on about diopters, but they\'re not a part of
either known or unknowns in what he\'s trying to calculate or confirm.
Well, the diopter is just the reciprocal of the focal length in metres, so
it is relevant. Opticians use diopters because lenses can be stacked
in front of each other and the powers in diopters simply add or subtract
as appropriate. This is much easier than working directly with focal lengths.
It\'s just like resistors in parallel.
When is the last time you use mhos in a calcuation?
I type
rval
1/x
(RPN) often. I don\'t call them mhos; they are actually Siemens.
What resistor do you put across 5 ohms to get 3 ohms?
3
1/x
5
1/x
-
1/x
Seems like the answer is never. I see lots of repetetive 1 over
calculations.
There really is no going back once you learn RPN. Even a fancy calculator
where you can see rows of nested braces just doesn\'t compare.
I always though mhos were just odd. So when did you last use susceptance,
in siemens of course? Maybe it\'s time to hawk special \"ultra high
susceptance\" cables to the audiophiles.
I have an app on my Android phone, Free42, which looks and feels a lot
like a classic HP calculator. Very nice.
Are kids learning RPN these days?
Not directly. They push python as a programming language, and it\'s real
backwards, but no official RPN classes anywhere. TI still runs the
cartel for school approved graphing calculators.
I\'m not even sure what they teach these days that offers any real value
outside of constantly taking tests ina school, and learning how to be meek
and offended by everything.
Was chatting with a machinist who say they regularly have people apply for
assembly jobs at the factory and can\'t even use a socket wrench. They pass
on those folks. People are so helpless fewer and fewer cars even come with
a spare, as they know the driver won\'t be able to change it in the first
place. Sad times.
they did the math, a spare is used so rarely that it is a waste of space and
fuel to carry one around
Lasse Langwadt Christensen <lang...@fonz.dk> wrote:
onsdag den 17. august 2022 kl. 06.12.59 UTC+2 skrev Cydrome Leader:
John Larkin <jlarkin@highland_atwork_technology.com> wrote:
On Tue, 16 Aug 2022 21:06:12 -0000 (UTC), Cydrome Leader
pres...@MUNGEpanix.com> wrote:
jla...@highlandsniptechnology.com wrote:
On Mon, 15 Aug 2022 18:26:44 -0000 (UTC), Cydrome Leader
pres...@MUNGEpanix.com> wrote:
jla...@highlandsniptechnology.com wrote:
On Sun, 14 Aug 2022 15:12:04 -0700 (PDT), John Walliker
jrwal...@gmail.com> wrote:
On Friday, 12 August 2022 at 19:24:32 UTC+1, Cydrome Leader wrote:
Joe Gwinn <joeg...@comcast.net> wrote:
On Fri, 12 Aug 2022 04:40:54 -0000 (UTC), Cydrome Leader
pres...@MUNGEpanix.com> wrote:
John Larkin <jjla...@highlandtechnology.com> wrote:
On Thu, 11 Aug 2022 16:38:38 -0700, John Larkin
jjla...@highlandtechnology.com> wrote:
What\'s a good way to measure the negative diopter of my glasses, given
minimal tools up the the cabin?
I can let the sun shine through a lens and see an enlarged circle on
the ground a few feet away. What\'s the math on that?
I found it online.
https://physics.stackexchange.com/questions/566207/how-to-measure-the-strength-of-a-prescription-eyeglass-lens
My lens is 2\" wide and sunlight projects a 4\" wide image at 11\" from a
screen. So the fl of the lens is -11\".
That\'s bad, since that eye focuses at about 17\". These glasses are
over-correcting.
You\'re pulling some weird NASA moves by asking \"what\'s the diopter of a
lense\" and then concluding a focal length of -11 inches.
Nothing weird here. Just some simple optics.
It is weird. He\'s going on about diopters, but they\'re not a part of
either known or unknowns in what he\'s trying to calculate or confirm.
Well, the diopter is just the reciprocal of the focal length in metres, so
it is relevant. Opticians use diopters because lenses can be stacked
in front of each other and the powers in diopters simply add or subtract
as appropriate. This is much easier than working directly with focal lengths.
It\'s just like resistors in parallel.
When is the last time you use mhos in a calcuation?
I type
rval
1/x
(RPN) often. I don\'t call them mhos; they are actually Siemens.
What resistor do you put across 5 ohms to get 3 ohms?
3
1/x
5
1/x
-
1/x
Seems like the answer is never. I see lots of repetetive 1 over
calculations.
There really is no going back once you learn RPN. Even a fancy calculator
where you can see rows of nested braces just doesn\'t compare.
I always though mhos were just odd. So when did you last use susceptance,
in siemens of course? Maybe it\'s time to hawk special \"ultra high
susceptance\" cables to the audiophiles.
I have an app on my Android phone, Free42, which looks and feels a lot
like a classic HP calculator. Very nice.
Are kids learning RPN these days?
Not directly. They push python as a programming language, and it\'s real
backwards, but no official RPN classes anywhere. TI still runs the
cartel for school approved graphing calculators.
I\'m not even sure what they teach these days that offers any real value
outside of constantly taking tests ina school, and learning how to be meek
and offended by everything.
Was chatting with a machinist who say they regularly have people apply for
assembly jobs at the factory and can\'t even use a socket wrench. They pass
on those folks. People are so helpless fewer and fewer cars even come with
a spare, as they know the driver won\'t be able to change it in the first
place. Sad times.
they did the math, a spare is used so rarely that it is a waste of space and
fuel to carry one around
Who did the math? Airbgs and seatbelts seem like a waste too by the same
MBA logic.
Lasse Langwadt Christensen <langwadt@fonz.dk> wrote:
onsdag den 17. august 2022 kl. 06.12.59 UTC+2 skrev Cydrome Leader:
John Larkin <jlarkin@highland_atwork_technology.com> wrote:
On Tue, 16 Aug 2022 21:06:12 -0000 (UTC), Cydrome Leader
pres...@MUNGEpanix.com> wrote:
jla...@highlandsniptechnology.com wrote:
On Mon, 15 Aug 2022 18:26:44 -0000 (UTC), Cydrome Leader
pres...@MUNGEpanix.com> wrote:
jla...@highlandsniptechnology.com wrote:
On Sun, 14 Aug 2022 15:12:04 -0700 (PDT), John Walliker
jrwal...@gmail.com> wrote:
On Friday, 12 August 2022 at 19:24:32 UTC+1, Cydrome Leader wrote:
Joe Gwinn <joeg...@comcast.net> wrote:
On Fri, 12 Aug 2022 04:40:54 -0000 (UTC), Cydrome Leader
pres...@MUNGEpanix.com> wrote:
John Larkin <jjla...@highlandtechnology.com> wrote:
On Thu, 11 Aug 2022 16:38:38 -0700, John Larkin
jjla...@highlandtechnology.com> wrote:
What\'s a good way to measure the negative diopter of my glasses, given
minimal tools up the the cabin?
I can let the sun shine through a lens and see an enlarged circle on
the ground a few feet away. What\'s the math on that?
I found it online.
https://physics.stackexchange.com/questions/566207/how-to-measure-the-strength-of-a-prescription-eyeglass-lens
My lens is 2\" wide and sunlight projects a 4\" wide image at 11\" from a
screen. So the fl of the lens is -11\".
That\'s bad, since that eye focuses at about 17\". These glasses are
over-correcting.
You\'re pulling some weird NASA moves by asking \"what\'s the diopter of a
lense\" and then concluding a focal length of -11 inches.
Nothing weird here. Just some simple optics.
It is weird. He\'s going on about diopters, but they\'re not a part of
either known or unknowns in what he\'s trying to calculate or confirm.
Well, the diopter is just the reciprocal of the focal length in metres, so
it is relevant. Opticians use diopters because lenses can be stacked
in front of each other and the powers in diopters simply add or subtract
as appropriate. This is much easier than working directly with focal lengths.
It\'s just like resistors in parallel.
When is the last time you use mhos in a calcuation?
I type
rval
1/x
(RPN) often. I don\'t call them mhos; they are actually Siemens.
What resistor do you put across 5 ohms to get 3 ohms?
3
1/x
5
1/x
-
1/x
Seems like the answer is never. I see lots of repetetive 1 over
calculations.
There really is no going back once you learn RPN. Even a fancy calculator
where you can see rows of nested braces just doesn\'t compare.
I always though mhos were just odd. So when did you last use susceptance,
in siemens of course? Maybe it\'s time to hawk special \"ultra high
susceptance\" cables to the audiophiles.
I have an app on my Android phone, Free42, which looks and feels a lot
like a classic HP calculator. Very nice.
Are kids learning RPN these days?
Not directly. They push python as a programming language, and it\'s real
backwards, but no official RPN classes anywhere. TI still runs the
cartel for school approved graphing calculators.
I\'m not even sure what they teach these days that offers any real value
outside of constantly taking tests ina school, and learning how to be meek
and offended by everything.
Was chatting with a machinist who say they regularly have people apply for
assembly jobs at the factory and can\'t even use a socket wrench. They pass
on those folks. People are so helpless fewer and fewer cars even come with
a spare, as they know the driver won\'t be able to change it in the first
place. Sad times.
they did the math, a spare is used so rarely that it is a waste of space and
fuel to carry one around
Who did the math? Airbgs and seatbelts seem like a waste too by the same
MBA logic.
On Mon, 3 Oct 2022 20:37:09 -0000 (UTC), Cydrome Leader
pres...@MUNGEpanix.com> wrote:
Lasse Langwadt Christensen <lang...@fonz.dk> wrote:
onsdag den 17. august 2022 kl. 06.12.59 UTC+2 skrev Cydrome Leader:
John Larkin <jlarkin@highland_atwork_technology.com> wrote:
On Tue, 16 Aug 2022 21:06:12 -0000 (UTC), Cydrome Leader
pres...@MUNGEpanix.com> wrote:
jla...@highlandsniptechnology.com wrote:
On Mon, 15 Aug 2022 18:26:44 -0000 (UTC), Cydrome Leader
pres...@MUNGEpanix.com> wrote:
jla...@highlandsniptechnology.com wrote:
On Sun, 14 Aug 2022 15:12:04 -0700 (PDT), John Walliker
jrwal...@gmail.com> wrote:
On Friday, 12 August 2022 at 19:24:32 UTC+1, Cydrome Leader wrote:
Joe Gwinn <joeg...@comcast.net> wrote:
On Fri, 12 Aug 2022 04:40:54 -0000 (UTC), Cydrome Leader
pres...@MUNGEpanix.com> wrote:
John Larkin <jjla...@highlandtechnology.com> wrote:
On Thu, 11 Aug 2022 16:38:38 -0700, John Larkin
jjla...@highlandtechnology.com> wrote:
What\'s a good way to measure the negative diopter of my glasses, given
minimal tools up the the cabin?
I can let the sun shine through a lens and see an enlarged circle on
the ground a few feet away. What\'s the math on that?
I found it online.
https://physics.stackexchange.com/questions/566207/how-to-measure-the-strength-of-a-prescription-eyeglass-lens
My lens is 2\" wide and sunlight projects a 4\" wide image at 11\" from a
screen. So the fl of the lens is -11\".
That\'s bad, since that eye focuses at about 17\". These glasses are
over-correcting.
You\'re pulling some weird NASA moves by asking \"what\'s the diopter of a
lense\" and then concluding a focal length of -11 inches.
Nothing weird here. Just some simple optics.
It is weird. He\'s going on about diopters, but they\'re not a part of
either known or unknowns in what he\'s trying to calculate or confirm.
Well, the diopter is just the reciprocal of the focal length in metres, so
it is relevant. Opticians use diopters because lenses can be stacked
in front of each other and the powers in diopters simply add or subtract
as appropriate. This is much easier than working directly with focal lengths.
It\'s just like resistors in parallel.
When is the last time you use mhos in a calcuation?
I type
rval
1/x
(RPN) often. I don\'t call them mhos; they are actually Siemens.
What resistor do you put across 5 ohms to get 3 ohms?
3
1/x
5
1/x
-
1/x
Seems like the answer is never. I see lots of repetetive 1 over
calculations.
There really is no going back once you learn RPN. Even a fancy calculator
where you can see rows of nested braces just doesn\'t compare.
I always though mhos were just odd. So when did you last use susceptance,
in siemens of course? Maybe it\'s time to hawk special \"ultra high
susceptance\" cables to the audiophiles.
I have an app on my Android phone, Free42, which looks and feels a lot
like a classic HP calculator. Very nice.
Are kids learning RPN these days?
Not directly. They push python as a programming language, and it\'s real
backwards, but no official RPN classes anywhere. TI still runs the
cartel for school approved graphing calculators.
I\'m not even sure what they teach these days that offers any real value
outside of constantly taking tests ina school, and learning how to be meek
and offended by everything.
Was chatting with a machinist who say they regularly have people apply for
assembly jobs at the factory and can\'t even use a socket wrench. They pass
on those folks. People are so helpless fewer and fewer cars even come with
a spare, as they know the driver won\'t be able to change it in the first
place. Sad times.
they did the math, a spare is used so rarely that it is a waste of space and
fuel to carry one around
Who did the math? Airbgs and seatbelts seem like a waste too by the same
MBA logic.
If you read old books, up to 1960s maybe, \"punctures\" were very
common. Nowadays tires rarely go flat, or even lose much air.
On Mon, 3 Oct 2022 20:37:09 -0000 (UTC), Cydrome Leader
presence@MUNGEpanix.com> wrote:
Lasse Langwadt Christensen <langwadt@fonz.dk> wrote:
onsdag den 17. august 2022 kl. 06.12.59 UTC+2 skrev Cydrome Leader:
Was chatting with a machinist who say they regularly have people apply for
assembly jobs at the factory and can\'t even use a socket wrench. They pass
on those folks. People are so helpless fewer and fewer cars even come with
a spare, as they know the driver won\'t be able to change it in the first
place. Sad times.
they did the math, a spare is used so rarely that it is a waste of space and
fuel to carry one around
Who did the math? Airbgs and seatbelts seem like a waste too by the same
MBA logic.
If you read old books, up to 1960s maybe, \"punctures\" were very
common. Nowadays tires rarely go flat, or even lose much air.