[GreenKeys] Wheatstone Tape Perforator - Kleinschmidt, Creed, Teletype, Boehme

[W2HX]

That is correct, Jim. I believe the pole-changer (double current) keys would be used to reverse the current like a polar signal.  I have an ATM Undulator (more commonly called siphon recorder). Here are some pictures

https://w2hx.com/?prefix=x/Telegraphy/ATM%20Siphon%20Recorder/

 
73 Eugene W2HX/4

My Youtube Channel: https://www.youtube.com/@w2hx/videos
 
 
-----Original Message-----
From: greenkeys-bounces at mailman.qth.net <greenkeys-bounces at mailman.qth.net> On Behalf Of Jim Haynes via GreenKeys
Sent: Friday, September 25, 2026 12:52 PM
To: Jim Haynes via GreenKeys <greenkeys at mailman.qth.net>
Subject: Re: [GreenKeys] Wheatstone Tape Perforator - Kleinschmidt, Creed, Teletype, Boehme

Something slightly related to all this is the code used in ocean cable work.  If I understand it they used Morse but dot was one polarity and dash was the opposite polarity.  Received on an ink recorder, and the operators were trained to read the recordings when the speed was close to exceeding the bandwidth of the cable.

 	---

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