In operation, a long pivoted pointer carrying a pen and actuated by electromagnets, records on a revolving drum, a wave form representing the alternating current, voltage or current wave.
For a list of all these illustrations used in Wikipedia please see the article Hawkins Electric Guide on the English Wikipedia.
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== Summary == === Illustration Description === Figure 2958 -- View of Hospitalier Ondograph In operation, a long pivoted pointer carrying a pen and actuated by electromagnets, records on a revolving drum, a wave form representing the alternating current,
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