Automatic Oscillograph from the 1930's.
The first automated oscillographs used a galvanometer to move a pen across a scroll or drum of paper, capturing wave patterns onto a continuously moving scroll. Due to the relatively high-frequency speed of the waveforms compared to the slow reaction time of the mechanical components, the waveform image was not drawn directly but instead built up over a period of time by combining small pieces of many different waveforms, to create an averaged shape.
Size: 6085px × 3719px
Location: USA
Photo credit: © Paul Briden / Alamy / Afripics
License: Licensed
Model Released: No
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