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File:Coolidge xray tube.jpg

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X-ray glasses funt

Summary

Description Photo of a Coolidge x-ray tube, from the early 1900s. The cathode is on the left, heated by a separate current passing through a filament, which releases electrons into the tube. The anode target is on the right. A high voltage of several thousand volts applied between the cathode and anode accelerates the electrons into a beam which strikes the anode, generating x-rays. The surface of the anode is angled so the x-rays are emitted in a downward direction, through the side of the tube. Alterations: rotated image 90° clockwise, cropped out frame
Date
Source Downloaded from Daniel Frost Comstock & Leonard T. Troland (1917) The Nature of Matter and Electricity: An Outline of Modern Views, D. Van Nostrand Co., New York, p.190, Plate 5 on Google Books
Author Daniel Frost Comstock
Permission
(Reusing this file)		 Public domain - published in USA before 1923

Licensing

Public domain
Public domain
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.
United States
United States
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.

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Date/TimeThumbnailDimensionsUserComment
current03:58, 24 December 2007Thumbnail for version as of 03:58, 24 December 20071,076 × 412 (116 KB)Chetvorno{{Information |Description=Photo of a Coolidge x-ray tube, from the early 1900s. Alterations: rotated image 90° clockwise, cropped out frame |Source=Downloaded from [http://books.google.com/books?id=jQA4AAAAMAAJ&pg=PA190 Daniel Frost Comstock & Leonard

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