[GreenKeys] 28 stock ticker?

[Peter Gottlieb]

Bloomberg terminals before computers. 


Peter

> On Jul 30, 2019, at 6:15 PM, Jim Haynes <jhhaynes at earthlink.net> wrote:
> 
>> On Tue, 30 Jul 2019, Jeffrey Angus wrote:
>> 
>> Speaking of stock tickers, what was the one under a glass dome?
>> 
> There are several different stock tickers that were enclosed in glass
> bell jars.  You might google for Edison stock ticker to get an entry
> to the matter.  They all depended on a type wheel that stepped around
> until the desired character was under the print hammer.  One of the
> problems was keeping the type wheels synchronized with the sending
> machine.  This was solved by adding a mechanism which caused the wheel
> to hit a stop after several revolutions; thereafter it would be in sync
> with the sending machine.  There were also machines that required winding
> a spring or setting weights to power the wheel.  The late tickers
> propelled the wheel by current reversals sent over the wire, working a
> stair-step sort of escapement attached to the wheel.  Google for self
> winding ticker.
> 
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