[GreenKeys] Western Union

[John, W9DDD]

So what do think is in the WU version, a series wound 120VAC governed 
motor?

John, W9DDD

On 4/25/2019 9:44 AM, Jim Haynes wrote:
> On Thu, 25 Apr 2019, Peter Gottlieb wrote:
> 
>> Interesting, I assume they couldn’t count on line frequency and 
>> synchronous motors for speed control.
>>
>>
> Certainly not in an airplane.  And I guess not in other places either.
> 
> I found a document where Teletype R&D had been asked about putting in
> a sync motor.  On the first attempt they couldn't find a sync motor
> small enough to fit into the space that had enough torque to run the
> machine.  I don't know if there ever was a sync motor worked out for it.
> 
> 
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