McElroy Chart of Codes and Signals

If anyone knows where I can locate one of these charts, please send me an e-mail.

The chart contains, among other things:

I have received this e-mail regarding the chart:

McElroy was a manufacturer of machines to convert typing into paper tape for subsequent processing through a paper tape reader connected to a CW transmiter if memory serves me. I suppose the idea was that anyone could prepare a tape at leisure and transmit perfect Morse at whatever speed you wished...all without knowing Morse. Useful for weather broadcasts, etc. I think McElroy vanished after WWII as I was involved with long haul radio data links in the early 50s and don't remember seeing them or their equipment and we were using a lot of punched tape equipment that we punched up on Teletype model 15's.

Comments to Dan Veeneman

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Updated December 12, 2002