But from where comes the music?

[JeffM]

"how do they get different pitches?"
I assumed "More cogs on the wheel."
Apparently, that's not accurate. Any help here?
Rich Grise

It's exacty right.
There is a common driveshaft (see my "out of tune" quip),
and the lobe count on the reluctor gives the freq.

 

[Dave Cole]

in article BCAB61B09668297AF@192.168.0., Ralph & Diane Barone at
rdbarone@shaw.ca wrote on 4/21/04 01:24:

In article <f8b945bc.0404101815.e39dd6a@posting.google.com>,
jeffm_@email.com (JeffM) wrote:

"how do they get different pitches?"
I assumed "More cogs on the wheel."
Apparently, that's not accurate. Any help here?
Rich Grise

It's exacty right.
There is a common driveshaft (see my "out of tune" quip),
and the lobe count on the reluctor gives the freq.

Say, out of curiousity, how does Hammond reconcile the fact that the ratio
of two notes a semitone apart is an irrational number (12th root of 2)? Do
they just do closest whole number ratios for the number of teeth on each
gear?


AIUI they don't use a complete common shaft, but use gear reduction in each

subgroup of reluctors. Whether this solves your objection or not, I'm too
busy to calculate, but it is not a single common shaft they used.
HTH
Dave Cole

 

[JeffM]

they don't use a complete common shaft,
but use gear reduction in each subgroup of reluctors.
...it is not a single common shaft they used.
Dave Cole

Right, and Ben's worry about getting the interval just right
doesn't take into effect the human ear's need for imperfection.
Having things just a bit off
results in slow beat frequencies (chorale or celeste)
which gives a "warmth" to the sound instead of mechanical perfection.

When you tune a pipe organ in the morning,
in the evening it's a little off because of temperature and humidity.