Summary

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 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

Upload Notes

• 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.

Licensing

	This media file is in the public domain in the United States. This applies to U.S. works where the copyright has expired, often because its first publication occurred prior to January 1, 1929, and if not then due to lack of notice or renewal. See this page for further explanation.
	This image might not be in the public domain outside of the United States; this especially applies in the countries and areas that do not apply the rule of the shorter term for US works, such as Canada, Mainland China (not Hong Kong or Macao), Germany, Mexico, and Switzerland. The creator and year of publication are essential information and must be provided. See Wikipedia:Public domain and Wikipedia:Copyrights for more details.