[GreenKeys] Two rare model 11 machines turned up in Finland!

[Duncan Brown]

Juha,

Thanks for the pictures of your great find of M11 machines!!  Also 
thanks for the Collections Online link - I had not seen that before!

The M11 was designed as a small, compact, tape printer that operated at 
50wpm and was typically used for local message service, such as in 
hotels and other businesses.  There was a receive-only version with a 
glass top that was designed for stock ticker service. This was one of 
the first start-stop, serial, 5-bit machines. (In the early 1920s, most 
printing telegraphs [including the Morkrum M12] were used on 
synchronous, multiplexed systems.)

There is an article in "Journal of the Western Society of Engineers" vol 
XXVI, March 1921
     "The Development of the Printing Telegraph", by J. O. Carr (chief 
engineer, Morkrum Co.) that you  can find on Google Books. The first 
part of the article is on the history of the printing telegraph, but on 
p131, he starts talking about Morkrum's newest unit the M11 and gives 
some good description of it. You can get to the article at:

https://books.google.com/books?id=Z0wyAQAAMAAJ&pg=PA124&lpg=PA124&dq=Wheatstone+Mallet+Perforator&source=bl&ots=nnb_QW2imO&sig=uKKDfCs0oKCT9dGvnBNvI-cCEiE&hl=en&sa=X&ei=cDyLVO__GtKcygSR5ICQAQ&ved=0CCIQ6AEwAQ#v=onepage&q=Wheatstone%20Mallet%20Perforator&f=false

though this will put you into a section of the article on the Wheatstone 
Perforator. Just scroll down to p 131 for the M11.

There is a pdf of the parts list Bulletin on the M11, Bul 1014, 
available on the Internet somewhere, dated Jun, 1927, so they were still 
in  use then.  The "Morkrum" label dates  your machines as pre 1925 
(when Morkrum and Kleinschmidt combined).

Besides the air-ground use of the M11, the Krums also experimented with 
ground-based radioteletype over a distance of almost 100 miles. I have a 
pdf of a 1922 article from "Radio News" on the air to ground experiment 
with the M11 that I got from Jim Haynes, if  you are interested.

Good luck with your new find and have fun!

Duncan Brown, K2OEQ
USASA  31J30

Antique Wireless Association Museum Asst. Curator, Commercial Equipment
(also Chief TTY operator & repairman)
http://www.antiquewireless.org/


On 21-Nov-16 09:06, Juha Lahtinen wrote:
>
> Hello
>
> It did Print Text.
>
> Here is nice pics from England when I just Google” Morkrum Teletype”
>
> http://collectionsonline.nmsi.ac.uk/browser.php?m=objects&kv=8366680&i=382140
>
> For Some reason I can see they have not find right History information 
> from your side.
>
> It would be interesting to know what kind of  network Schema this 
> would work.
>
> Thanks
>
> Best Regards Juha
>
>


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