[GreenKeys] Fw: BBC enquiry - telegraph machine

[WA5CAB--- via GreenKeys]

Right.  The Undulator had what I knew as a pen motor or a galvonometer.  
But my question was, did it have only one, or more than one?

Robert Downs - Houston
wa5cab dot com (Web Store)
MVPA 9480

In a message dated 06/19/2014 11:21:58 AM Central Daylight Time, 
jhhaynes at earthlink.net writes: 
> Let's keep in mind that there are two different flavors of paper tape
> code recorders.  The one used for Morse Code at ordinary speeds, and
> for recording telephone numbers and fire alarms, and often made by
> J. H. Bunnell, uses an electromagnet to make an ink mark on the tape.
> Or to emboss the tape.  The other kind, the undulator, is an analog
> recorder, that records the magnitude and direction of current, not
> simply whether the current is on or off.  That's what was used with
> ocean cable telegraphy.
> 
> jhhaynes at earthlink dot net
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