[GreenKeys] Model 19 gears

[Jim Haynes]

On Tue, 24 Jul 2018, Jerry Murphy wrote:
>
> You mention that the motor pinion has a number stamped on it of 74919LS.
> Teletype Bulletin 1114 shows the 74919 pinion (7T) and the 74920 gear (46T)
> being used with a 60 Hz sync. motor for 40 WPM service.  This seems to be
> an unlikely setup.
>
Aha!  I only looked at my copy of 1114B, which is a fairly late one, and
didn't think to try Nick's site.  So probably the "LS" means "low speed".

Seems unlikely to me too, but the fact that gears were manufactured for
that speed shows that it was used at one time.  Possibly for 
inter-operation with older teleprinters.