File:Hospitalier Ondograph.png

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, voltage or current wave.

• Hawkins Electrical Guide, Volume 6
• Chapter 63: Wave Form Measurement
• Page 1851, Figure 2958
• Copyright 1917 by Theo. Audel & Co.
• Printed in the United States

• Scanned by User:DMahalko, Dale Mahalko, Gilman, WI, USA -- Email: dmahalko@gmail.com, on 22:39, 18 May 2008 (UTC)
• Scanned at 600dpi, 8-bit grayscale
• Level-adjusted and cleaned up

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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