[GreenKeys] Id keyboard

[Duncan Brown]

Yes, it is a Morkrum (pre-Teletype Corp.) Model 12 keyboard from about 
1920, although I have not seen one like this with the distributor.  It 
may be an early version.

I agree that the distributor is probably for serial  to parallel 
conversion for the printer. Other M12s I've seen use the goose-neck 
levers & cams (like for the keyboard) for the printer series to parallel 
conversion.  See Attached.

The M12 was the first practical teletypewriter printer.  It was 
initially just a parallel-input printer (with five selector magnets) 
used with the early Murray Multiplex System. When the (serial) 
Start-Stop System came into general use, the M12s could be converted to 
"Direct-to-Line" operation by adding a keyboard with its own motor and 
serial-to-parallel conversions.

The M14 & M15 used the same keyboard mechanics.


Have fun,

Duncan
K2OEQ


On 12/6/2024 10:46 PM, Harold Hallikainen via GreenKeys wrote:
> It IS interesting! It does look like a model 15 keyboard in the lower part
> of the picture. I recognize the switches and cams that do the parallel to
> serial conversion. There is a shaft sticking out to the right that would
> normally have a gear driven by the main shaft of the model 15.
>
> But, there is a motor and distributor near the top of the photo. As
> mentioned by others, that COULD be the receive serial to parallel
> conversion for a model 12. I note small segments in the distributor that
> might be for sampling the data in the middle of the bit.
>
> But, it doesn't look like the unit at
> https://navy-radio.com/manuals/tty/114B-M12-2705.pdf .
>
> Harold
> https://w6iwi.org
>
>
> On Fri, December 6, 2024 8:00 pm, Jeffrey Golas wrote:
>> Seen at a local science museum...whats it from? Its not a 15/19 (they had
>> that too)
>>
>> Jeff KC3GJX
>>
>>
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