What is the purspose of pre-tinned wire?

On Apr 23, 12:38 am, Dr. Heywood R. Floyd
<Heyw...@thebarattheendofthemonolith.org> wrote:

On Thu, 23 Apr 2009 12:50:21 +1000, Bob Larter <bobbylar...@gmail.com
wrote:





msg wrote:
Bob Larter wrote:

msg wrote:

snip
Indeed, and I don't expect a large operator like Cox to do it, but
some ISPs
NAT their clients with RFC-1918 addresses, all of which translate to
a single
public IP, ergo, many NNTP users may all originate from a single IP.

True, but it's quite rare at ISPs. NATing is usually done in
businesses, rather than at ISPs.

 From time to time (for many years now) I deal with issues involving H.323
and RTP connectivity (payload contains IP information) and I am always
surprised by the number of ISPs I encounter that NAT their clients. These
are mostly small operators and often rural. I too run a neighborhood WISP
that NATs the clients, many of whom use the same O/S and NNTP user agents,
and I would be quite distressed if newsgroup readers assumed that IP
addresses and message headers uniquely identify the poster who just
happened
to be a neighbor and not myself.

On the bright side, DimBulb clearly isn't on a NATed IP, so one can
confidently filter him out with it.

  Bwuahahahahahah!  Filter boy doesn't have a clue.

 Just so you know, idiot, this is all on the same cable modem.

  I *could* also get on the wireless and simply grab up any number of
currently unsecured networks in the local area, but that *would* be
illegal, as opposed to the fact that I have done nothing illegal on my
computer.

  Om the bright side, I can prod you upside da haed ANY TIME I want to,
idiot.- Hide quoted text -

- Show quoted text -

TUWAHAHAHAHA

CLOSET BOY FINALLY COMING OUT ?

SPREAD WIDE

I WANT TO TRY THIS NEW TITANIUM BASED LUBRICANT I FOUND AT NASA ON YOU

I AM PROTEUS

 

[Archimedes' Lever]

On Mon, 27 Apr 2009 14:01:57 -0700 (PDT), proteusiiv@gmail.com wrote:

I WILL DEEP

Shut up, Roy, you absolute retard.

 

On Apr 27, 9:26 pm, Archimedes' Lever <OneBigLe...@InfiniteSeries.Org>
wrote:

On Mon, 27 Apr 2009 14:01:57 -0700 (PDT), proteus...@gmail.com wrote:
I WILL DEEP

  Shut up, Roy, you absolute retard.

USER ARCHIMEDES' YOU ARE CONFUSED
PERHAPS I HAVE PROBED YOUR ANUS TOO OFTEN
I AM NOT ROY
APPARENTLY YOU HAVE SOMEUNRESOLVED ISSUES WITH HIM THAT NEED CLOSURE
ALL I CAN DO IS DEEP PROBE YOUR ANUS IN HOPE YOU WILL FORGET HIM BUT
IF YOU NEED TO CONTACT HIM I SUGGEST YOU CONTACT WEBTV NETWORKS THEY
MAY HAVE FURTHER INFO ON HIM
I HAVE NOT FOUND HIM ONLINE SINCE HIS DEPARTURE TO THE ALASKA
MAYBE HE IS ON AS ANOTHER USER BUT I DOUBT IT I WOULD HAVE FOUND HIM
LIKE I FOUND YOUR FAGGOTY LOVE LORN ANUS

I AM PROTEUS

 

[Nicholas Bodley]

(Misspelled Subject corrected)
On Fri, 17 Apr 2009 04:14:40 +0100, Sandi wrote:

Some insulated multistrand copper wire is pre-tinned and a lot is not.

First, I apologize for such a long-delayed reply. Just recently resumed
USENETting after several years. The flaming was pathetic (and apparently
cross-posted, no less!). When I tried to delete the flame messages, the
Pan newsreader crashed openSUSE 11.1! Needed to reboot. Never happened
before... (Pan is typically very stable, ditto SUSE.)

Anyhow, the worthwhile messages brought a lot to mind. (I built my first
radio at 6, adapting a Meissner circuit, fwiw, and I'm 73.)

In my experience, untinned stranded insulated Cu wire is rare, and
probably meant for uncritical applications that use screw terminals.

Speaking of rare wire types, only once since 1942 have I ever seen two-
conductor cable (including line/mains power cords) that had no way to
distinguish which wire was which. Otoh, inside a Hammond tonewheel organ,
and (late 1950s) perhaps most electric-action pipe organs, multiconductor
cables had no wire ID. (I don't know about cables between consoles and
the organ proper, though.)

I didn't see any mention of fused tinned stranded Cu wire.
Although uncommon in my experience, it's nice to strip in a production
environment, yet the bonds between the strands are weak enough that they
break easily when the wire is flexed.

Coatings, whether tin, solder, or Ag, must be applied before the
individual strands are joined. Didn't see any mention of that.

I distinctly recall reading about relays (probably contactors -- for
power -- with Ag oxide/Cd contacts; iirc, those don't weld easily, if at
all, but that could be wrong.

Btw, thanks for the chemistry!

Was wondering about the term "cinch" -- whether that's a formal
engineering term; I knew them as "crimp" connectors, but I think
"compression fitting" might be the formal term. As many know, Cinch was a
company that made some fine products; dunno about its present status.
(Merged, to form Cinch-Jones, iirc, but what happened to C-J, I don't
know.)

An important point about reliable solderless connection schemes, including
properly-engineered [crimp] connectors, Wire Wrap [TM}, and Termi-Point
is that all make a "gas-tight" connection. The wire and the metal it
connects to are forced together under great pressure, typically deforming
the wire and maybe the other part as well, so the boundary between them
cannot be penetrated by gas (under ordinary circumstances, at least).

I once read that when an intermittent poor connection is suspect,
submerge the device (operating) into a vat of sulfur hexafluoride gas,
and if there's a non-gas-tight connection, it will open up!

Anybody for Cool-Amp, an electroless Ag plating prep. used for joining Cu
busbar? True, that's not for ordinary electronics, but, megawatt stuff,
more likely.

Mentions of Cu oxide reminded me of Cu oxide rectifiers, which were in
use long before Se, Ge, or Si rectifiers. Cu oxide rectifiers had low
forward drop, pretty sure, which helped in measuring low voltage AC.

(Anybody remember Mg/Cu sulfide rectifiers, btw? What was good/bad about
them?)

Apologies, and regards,

--
Nicabod =+= Waltham, Mass.
who never worked on megawatt electronics

 

[Nigel Feltham]

Nicholas Bodley wrote:

Speaking of rare wire types, only once since 1942 have I ever seen two-
conductor cable (including line/mains power cords) that had no way to
distinguish which wire was which. Otoh, inside a Hammond tonewheel organ,
and (late 1950s) perhaps most electric-action pipe organs, multiconductor
cables had no wire ID. (I don't know about cables between consoles and
the organ proper, though.)

Here in the UK I've a Desk fan I inherited from my grandparents that has a
mains cable with no distinguishing marks - the cable is like a 3 core
ribbon cable with clear insulation on all 3 wires (no outer insulation),
when I was a kid I once stayed with gran in the summer and wanted to put it
on to cool the room and found someone had taken the plug off. Without
access to a multimeter I had to disassemble gran's torch and use the
battery and bulb to find the earth wire and guess the other 2. As far as I
know the plug's not been changed or rewired since.

But then again it's got no guard round the fan blades either (but motor is
so weak the blades stop easily when touched) - wasn't health & safety
ruling much more fun years ago (I've no idea how old it is, I'm guessing
40's or 50's).

 

[Nicholas Bodley]

On Sun, 19 Jul 2009 15:55:17 +0100, Nigel Feltham wrote:

Here in the UK I've a Desk fan I inherited from my grandparents that has
a mains cable with no distinguishing marks - the cable is like a 3 core
ribbon cable with clear insulation on all 3 wires (no outer insulation)

Enjoyed your message!

You remind me that Boston, Mass. has apparently been slow to provide AC
power everywhere. A friend says that one city building has various
voltages, some DC, and some AC. However, he's told other tall tales that
stretch credibility to the breaking point.

In the mid-1960s or so, the New Yorker Hotel was the venue of the annual
Audio Engineering Society convention. As the exhibits were being set up,
all of a sudden word got around that the outlets were DC, most likely 120
V, and UNMARKED! Apparently, line fuses and circuit breakers don't
necessarily protect their loads from burnout when the device is fed with
DC at rated voltage. (But, universal (AC/DC) motors, anyone?) Whether any
motors and/or power transformers burned out, I don't know.

As a kid, probably during WW II, I remember visiting my uncle's office on
Bromfield St. which had DC power. His desk fan motor had a lovely little
commutator plainly visible on the back; it was maybe 3/4 inch / 2 cm in
diameter, if even that big.

Afaik, the U.K. only comparatively recently standardised on those quite-
big plugs. I used to read in Wireless World about buying appliances
without plugs, because iirc there was no one national standard.

Best regards from across the big pond,
--
Nicabod =+= Waltham, Mass.
using British spelling
of one word; why not?