Figure 2625 -- Oscilliograph recorded on moving film
Portion of oscillograph record taken with cinematograph film camera, showing the effect of switching off a high-voltage feeder circuit, and illustrating the the violent fluctuations produced by sparking at the circuit's switch contacts.
Public Domain Source
Hawkins Electrical Guide, Volume 6
Chapter 63: Wave Form Measurement
Page 1867, Figure 2625
Copyright 1917 by Theo. Audel & Co.
Printed in the United States
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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
See Also
For a list of all these illustrations used in Wikipedia please see the article Hawkins Electrical Guide on the English Wikipedia.
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=== Illustration Description === Figure 2625 -- Oscilliograph recorded on moving film Portion of oscillograph record taken with cinematograph film camera, showing the effect of switching off a high-voltage feeder circuit, and illustrating the the violent