[GreenKeys] Re: Model 12

[Don Robert House]

Thanks again for your most kind communications.  Morkrum is a 
contraction of Morton (of Morton Salt) and Charles Krum sponsors and 
inventors of the Model 11 and Model 12 printers. They were assisted 
By Edward E. Kleinschmidt.  Later models of the Model 12 and 14 have 
the name Morkrum-Kleinschmidt on them.  T

hen came the sale of the company to Western Electric, just before the 
sale the company name was changed to Teletype which is a contraction 
of Telephone Typewriter.

If the Morkrum printer is a wheel style tape printer it is an 11.  If 
it is a carriage style roll paper printer it is a 12.  These machines 
were multi-magent start stop machines.

The Model 10 is still something of a mystery as it was produced by 
Western Electric instead of Morkrum, however after the sale of 
Teletype the M10 was placed in the line-up and in the Teletype Museum 
as well.  Technical images of the Model 10 are not indentified as 
"10"  The early Morkrum printer drawings we see from the Smithsonian 
show a Typewheel printer for roll paper so our mystery continues. 
Anything you can do to help will be greatly appreciated.

Don
Founder and Curator of NADCOMM
now part of the San Diego Computer Museum
(we are now looking for a new building and sponsors)



>Hi Don,
>
>Thanks for your E-Mail with photos from Jim.
>
>It seems that what you call the Model 12 is not the same as what the
>Australian Post Office called the model 12.
>
>As I said earlier, I have never seen a Teletype Model 12 keyboard
>transmitter, I can only go on the descriptions of Museum members who
>unfortunately have passed away in the last few years.
>
>We had been using the Morcrum printer with the Murray system since around
>1924. The Model 12 they told me about was a set of equipment which allowed
>the Morcrum to work as a start-stop machine.
>
>Although my background was from the postal side of the department, I have a
>keen interest in machines such as teleprinters, and after reading the old
>technicians manuals became fascinated by the Murray system. When I realised
>that the museum held all the more important components, over a number of
>weekly visits I eventually got the Murray demonstration working, and it has
>been reliable ever since. I did the same for the Sydney museum, but their
>Morcrum printer has been a constant source of disappointment as things keep
>going wrong with it, but that is another story.
>
>Why I mention this is because I discovered we had a pair of Model 12
>receiving distributors. These are fairly simple devices. I tried to get one
>of them to work the Morcrum by sending a signal from a Teletype 15. A
>polarised relay was required as Marks had to be converted to Spaces, and
>vice versa. I had no luck, probably because I had at that time anyway, no
>way of getting the Model 12 distributor motor going at the correct speed to
>suit the incoming Model 15 signal. Possibly the box shown beside the printer
>in the second photo contained one of these units.
>
>As for the transmitter for the Model 12, all I know is that the operator
>sent 'blind', there being no local copy produced nor was there any end of
>line warning. It simply sent the signal direcly to line. This contrasts with
>the first photo you sent.
>
>The MUX was phased out around 1955, the increased use of carrier for long
>distances being used with teleprinters instead. The reasoning was that when
>a 4 channel with duplex Murray line failed, 16 men were idle. With carrier,
>failures usually resulted in less men being idle. Unlike WU, all our
>telegraphist were men (except for some women during wartime) and a lot of
>effort went into keeping it an all-male bastion.
>
>If time permits I will try to find a photo of Model 12 transmitter at the
>museum on Wednesday.
>
>Best Wishes,
>Richard
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Don Robert House
P.O. Box 11
Ringwood, IL 60072-0011