McElroy Chart of Codes and Signals

The chart contains, among other things:

• International Morse code
• American Morse code
• Arabic Morse code
• Greek Morse code
• Japanese Morse code
• Turkish Morse code
• Aeronautical Q-codes
• Marine Q-codes
• Commercial Z-codes
• Semaphore and Flag codes

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.