[GreenKeys] 28 stock ticker?

[Jim Haynes]

That item is actually the first use of Model 37 technology.  No idea why
it was called Model 28 except maybe the Bell System wanted to reserve the
37 number for the page printing machines.  We had one in the lobby of the
Teletype R&D building in Skokie, slowed down to work with the stock
ticker service then in use.  The printing mechanism is called "aggregate
motion" because one bit of the signal moves the type box one unit, another
bit moves it two units, another 4 units and so on.  Similar logic was
used in the MITE and in the IBM Selectric typewriter.  The machine looked
very lazy in operation because the type box did not return to a home 
position after printing.  It just waited for the next character to move it
to the next position.

Anyway, a bunch of these machines were made and were supplied to the NYSE 
and Western Union and maybe others.  When Jack Hart saw the W.U. warehouse 
after that company's demise he found a lot of them, but didn't bring any 
home, so far as I know.  In my opinion that was the last successful 
Teletype product of a highly-mechanical nature.  The Model 37 page 
machines I would not consider successful.

The NYSE called it the "900" ticker because it could print 900 characters
per minute.

 	---

 	"Ya can argue all ya wanna, but it's dif'rent than it was."
 	"No it ain't! No it ain't!  But ya gotta know the territory."
 		Meredith Willson, The Music Man