File:Oscillograph Time-Index Generator.png

Summary[edit]

Illustration Description[edit]

Figure 2620 - Time-index marking generator for use with Duddell moving-coil oscillograph, consisting of a large rotating light-shutter wheel and a mirror moved by a cam, to draw marker lines on moving film as the shutter wheel rotates.

Public Domain Source[edit]

• Hawkins Electrical Guide, Volume 6
• Chapter 63: Wave Form Measurement
• Page 1865, Figure 2620
• Copyright 1917 by Theo. Audel & Co.
• Printed in the United States

Upload Notes[edit]

• Scanned by User:DMahalko, Dale Mahalko, Gilman, WI, USA -- Email: dmahalko@gmail.com
• Scanned at 600dpi, 8-bit grayscale
• Level-adjusted and cleaned up

See Also[edit]

For a list of all these illustrations used in Wikipedia please see the article Hawkins Electric Guide on the English Wikipedia.

Licensing[edit]

	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.