[GreenKeys] Re: Fw: Teletypewriters, part 2

[Phil Schelinski]

jhaynes@alumni.uark.edu wrote:
I forgot about the SOTUS Switch but remember replacing a "stepper switch" (a souped up Strowger version) at a nationwide trucking outfit near Midway airport without any training or instructions and somehow it worked.
 
Now maybe we can start a round of stories about adjusting 28ASR keyboards because some operators used to punch paper tape so fast they jammed the keyboards.
 
My first experience was at Republic Steel .
TTY operators at this Chicago Steel Mill used to party all weekend and could not get going on Monday AM, so they always called in stuck keyboards.
 After my first encounter there I was told to just open the cover -make at lot of noise - waste at least and hour and everything would suddenly work and it did!
 
 
 
I'm not sure why this is going to a select list rather than on greenkeys,
but I'm glad to be getting it. As some of you may know my "area of 
research" is electromechanical switching systems. Some of what is coming
across is new material to me.

For the 81D1 and earlier systems the station selector was the SOTUS -
sequentially operated teletypewriter universal selector. This was a 
machine that could detect individual characters or sequences of characters
and close a contact. 

For later systems I assume the Model 28 stunt box was used, since it had
all the capabilities of the SOTUS built into the printer. There
was a Model 28 replacement for the SOTUS, called the Model 28 sequential
selector. It was basically a typing unit with the front plate mechanism
removed.

I heard some customers objected to using the Model 28/35 stuntbox for
station selection. They didn't like the printer sitting there making
noise but not printing anything. This didn't seem to bother the F.A.A.,
who were one of the first big customers for Model 28 selective calling.



-- 

jhaynes at alumni dot uark dot edu



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