[GreenKeys] Dow Jones Teletype machine

[Duncan Brown]

Jim,

I think this Dow Jones "Broad Ticker" is more like the old tickers, not 
a stop-start machine.  The mechanism is very simple & it wasn't obvious 
how it worked. No typical selector magnets and code bars, so I assume it 
worked on pulses like the early tickers.

I haven't searched for the patents, but if it was patented in 1901-04, 
that would predate Morkrum's stop-start machines.

We have a Dow Jones brochure about their "News ticker". It shows this 
machine and also teletype corp M15 & M28ROs (with big "Dow Jones" logos 
on them).  So Dow Jones did distribute news with 5 bit stop-start 
signalling, but this is apparently an earlier machine.

Duncan

On 14-Dec-15 18:23, Jim Haynes wrote:
> I suspect it is a start-stop machine using 6-level code.  There was an
> article in one of the ARTS bulletins about modifying something that
> sounds like this to work on 5-level code in the early days of amateur
> RTTY.
>
> When you say it works like a ticker, I think that means the post-1929
> ticker that used a 6-level start-stop code, rather than the earlier
> glass-bell-jar tickers that worked by a sequence of pulses.
>
>


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