[GreenKeys] First stock ticker debuts 1867

[Jim Haynes]

I'm not sure the stock tickers operated inter-city that early, but I
don't know.  The stock ticker solved several problems.  First fair
trading by having all the brokers get the stock prices at the same
time.  Second avoided cheating my some Morse telegraph operators who
might use the stock prices to their own advantage by delaying them from
reaching the brokers.  Those early tickers I think required two wires
instead of one: one wire to rotate the type wheel and the other to
operate the print magnet when the desired character was over the tape.
So they were not as efficient as Morse or Baudot in use of wire and wire
time.  The early tickers had simple receiving machines and a more 
complicated sending machine, which was OK because the information was
broadcast from one sender to many receivers.

I'm not sure about the date for the last ticker - the Teletype "900" went
into service more like 1963 I think.  It used the principles of the
Model 37 machine and was what I consider the last successful Teletype
product of a highly mechanical nature.  (I don't consider the 37 and 38
to be successful)

The earlier tickers, the ones housed in glass bell jars, became too slow
for the NYSE around 1929.  When they were replaced by a newer model made
by Teletype, which used a six-bit binary code instead of the stepping
principle of the earlier ones, the old tickers were repurposed by W.U.
for reporting baseball scores and that sort of thing.  There was one of
those in my home town circa 1950.  The customer was a news stand, which
had several tables in the back where a bunch of old geezers sat at tables
playing dominoes all day, and presumably betting on the baseball games 
when it was baseball season.  Perhaps the old geezers were WW-I veterans
on pensions.  They drank coffee and Cokes because the town was in a dry
county.