[GreenKeys] FWD: Jim knows what those ladies are doing

[Don Robert House]

My sincere thanks to Jim Haynes for explaining the photograph
of the New York Stock Exchange operators. The special keyboard
is interesting... Possibly six level?

Don K9TTY
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Begin forwarded message:

From: Jim Haynes <jhhaynes at earthlink.net>
Date: 7 May 2013 9:36:25 AM CDT
To: Don Robert House <k9tty at dls.net>
Subject: Re: Does anyone know what these ladies are doing?

That is the sending installation of the NYSE that was put in along
with the new "900" stock tickers.  I don't know how it was used -
presumably the paper tickets are reports of trades and they are
keyboarding them into tape to be transmitted on the stock exchange
wire.  You can see in the right background some of the old black cube
tickers from 1930.  The "900" stock tickers were officially called
"Model 28" by the Bell System, but they actually used Model 37
technology.  In my opinion that was the last successful Teletype
product based on almost entirely mechanical technology.  The later
Model 37 and Model 38 didn't achieve much in the way of sales
and never got all the bugs worked out.  And the next successful
products were the 40 and 42/43 which used a lot of electronics.