[GreenKeys] The TTY Corp NYSE "900" Ticker

[DR HOUSE]

Here is some nice information on the last Teletype Ticker.
I sent an image of the 288B earlier which WUTCo called the 900.
The principles of operation are described by Jerry Murphy who
owned one of these.  I remember Jack Hart mentioning that he
thought it should have been called a 37 Tape Printer as the
mechanism is more like a 37 than a 28.  I suppose the character
set was the reason since the 37 was ASCII. I think 29 would have
been okay even if it had been used by other 6 level machines.

THANK YOU JERRY!!!!
73,
Don

Anyone who did not get the image, reply off list and I will send
it to you.



Hi Don:

This was a production model that was introduced in July, 1964
if we go by the date on the original manual.  The Technical
manual for the ticker was 288B.  Its title was "Technical Manual,
28 Tape Printer Set, (Stock Ticker).  The Parts manual was 1194B
and its title was "Parts, Teletype Tape Printer Set For Stock
Ticker Service."  I worked for Western Union in 1966 and it was
called "the 900" because it printed at 900 characters per minute.
It was only used on New York Stock Exchange ticker service.  All
of the other exchanges still used the 5A.  The 900 ticker was
gone from service by the end of the 60s.  It was too slow and
was replaced by electronic devices.

The ticker consisted of the following:
LP112TE typing unit  -  no stunt box
LB33 base
LMU42 motor  -  the motor turned in the opposite direction of a
               regular M28 motor.
LPC212HF cover

The ticker received 6 level code sent in a 9 bit format at 135
bits per second.  The mainshaft rotated at 514 RPM.  Three of the
clutches (selector, code bar and function) were of the 2 stop type.
All of the remaining clutches were 1 stop but acted like 2 stop
because of a clever design of sliding trip levers.  The idea of 1
stop clutches acting like 2 stop clutches was also seen in the
Model 37 printer.

Here's a link to the parts book for this ticker:
   http://hertzmail.com/TTY/TeletypeManuals/Model28/1194B.pdf

That manual is courtesy of Eugene Hertz.  I have a slightly newer
parts book and the Technical Manual.  The machine that I had -
the one in your picture - was sold to a fellow in Miami sometime
in the 90s.

Regards,  Jerry Murphy