[GreenKeys] Morkrum M12

[Don Robert House]

As usual Jim, good man that he is, puts the cake underneath the  
frosting!

The M12 is definitely a serial machine.
It is a multi-magnet serial machine not unlike the LARP.
Steve Ripper and Son are going to try to restore the M12 that I have  
here.

Since finding myself in the local E.R. with atrial fibrillation and a  
Transient Ischemic Attack (TIA)
I find it prudent to assign my various pieces of equipment to close  
friends I trust to share and preserve.

I am just fine with no damage reported by the hospitals equipment... I  
think they used just about everything...
However none of us live forever in these bodies... only in spirit.

73 to all,
DRH
K9TTY


On 08 Dec 2014, at 3:02 PM, Jim Haynes wrote:

> I believe the M12 was always considered a serial machine.  Teletype  
> got
> its business because the start-stop serial machines were more  
> practical
> for use in the small scale.  The alternative, synchronous operation,
> was pretty high-tech for its day and required maintenance people to be
> handy; hence was usable mainly between large telegraph offices.  At  
> the
> time the electrical distributor was the only way to deserialize the
> start-stop signal and then send it into a parallel printer.  It was
> quite a breakthrough when Howard Krum devised the original single- 
> magnet
> receiving selector.  Company lore says the design was sketched on a
> paper napkin while Krum was at Coney Island.  At the time electrical
> stuff was considered less reliable than mechanical stuff.  Insulation
> deteriorated and broke down; contacts pitted or developed insulating
> films preventing closure.  Wires broke from vibration and flexure.
>
> Teletype did have a time-division multiplex in the product line into  
> the
> 1930s.  This was of no interest to the Bell System, but was sold to
> customers such as railroads.  From photographs it is not clear if the
> printer used in the multiplex system is the same as the Model 12.
> However I received some information from a man in Australia which
> included a video of a Model 12 printer running, and I believe he said
> it was in a multiplex application.  The later electronic time-division
> multiplex belongs to the more modern era of Model 15 and Model 28 and
> was sold primarily to the military and other government users.
>
> jhhaynes at earthlink dot net
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