Chemical Code Recorder - Science Fair Project

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00:37:14

Shown in simulator is recording head wiring.
  
Square wave is Morse code radio or other code signal.  Two vertical SPST switches are bend up wires 1/32 inch or less apart with freshly coated paper tape coated with potassium iodide (from drugstore) being pulled underneath.  When recording head circuit is on a small brown line is made on a paper which is cranked through rubber pinch rollers.

Full drawings are in 1932 May Popular Mechanics Magazine on page 826.

published 10 years ago

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