[GreenKeys] Fw: BBC enquiry - telegraph machine

[Don Robert House]

Absolutely Robert,

The oscillograph we used in the ASCAC on the Randolph was impressive.   
It could stretch out a sonar ping about 5 feet wide. It would scare  
some of our guys that had never seen it shoot paper out like that  
before.
Still for dial pulse work on old trunk circuits the pen or chart  
recorder was nice and most were fairly easy to carry around.

Don



On 18 Jun 2014, at 6:00 PM, WA5CAB--- via GreenKeys wrote:

Although the term "pen recorder" or the similar "chart recorder"  
remained in use (especially among the raft of small oil patch  
companies who built their own), the term "oscillograph" became  
commonly used by companies like Bell & Howell, Honeywell, probably  
Gould, etc. who built commercial multi-channel ones that accomplished  
the recording process in various ways not limited to pen and ink.

In a message dated 06/18/2014 16:55:49 PM Central Daylight Time, 62.5milliamps at gmail.com 
  writes:
> In the Bell System we called them "Pen Recorders"  They were used with
> old alarm circuits for fire and police.
> We also used pen recorders, and the newer equivalent made by Gould, to
> track voltages and troubleshoot dial pulse problems.
>
> Don
> K9TTY
>
>
>
>
>
>
> On 17 Jun 2014, at 11:10 AM, Jim Haynes wrote:
>
> An undulator is an ink recorder.  Like a slow oscillograph, the inked
> line displays on a moving paper tape the polarity and amplitude of the
> signal coming out of an ocean cable.  In ocean cable work they used
> one polarity
> for dot and the other for dash, thus gaining speed.  And they tended  
> to
> push the speed of signaling above the bandwidth of the cable, so that
> the operator had to infer what was sent from the wiggles on the tape.
>
> Ink recorders were also used in high-speed Morse work (up to 500 wpm
> on radio circuits) but I don't think those were called undulators.   
> And
> they used conventional Morse make-and-break keying so the dashes were
> 3 times as long as the dots.
>
> jhhaynes at earthlink dot net


Robert & Susan Downs - Houston
wa5cab dot com (Web Store)
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