[GreenKeys] 100A Test Distributor Documentation

[DR HOUSE]

I am looking for documentation on the Teletype 100A Test Distributor.
I received one from Steve Hilsz that is interesting.

This unit was received by an AT&T Long Lines office on 9/25/1945.
It is stenciled to have a 60 CYCLE SYNC MOTOR and yet the gears  
installed are for a 50 Cycle Motor 102007:
Specifically Pinion 101847 (12 teeth) and Gear 101846 (39 teeth)  
producing 460 OPM.

The unit came with additional gears that are not shown on the chart  
that comes inside the unit.
Specifically Pinion 113887 (12 teeth) and Gear 113886 (37 teeth)

This unit also came with a Pinion 98626 (9 teeth) and Gear (98627 (44  
teeth) producing 360 OPM.
And with a Pinion 98603 (12 teeth) and Gear 98587 (47 teeth) producing  
460 OPM.
These last two sets are shown on the chart as for use with the 60  
Cycle Motor 97599.

Makes a person wonder if the wrong set of gears was used for all the  
tests the Long Lines people made...

The 100A sends a single repeating character depending on it's switch  
settings...
LTRS, V, M, O, T, or BLANK

The original Bell System Practice for this unit was P31.402 and  
AB83.801 at some point 9-digit practices superseded these.
The military also used this test distributor with a different  
designation that I have forgotten.
The primary purpose for this test set was for checking telegraph  
transmission rather than Teletype machines.

If any of you have any documentation on this unit I would like to  
receive a scan or borrow a copy to scan here.

Thank you for your time.

Don
K9TTY