File:Laser pistol.jpg
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Laser_pistol.jpg (564 × 257 pixels, file size: 26 KB, MIME type: image/jpeg)
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[edit]DescriptionLaser pistol.jpg |
English: A homemade laser pistol that shoots a laser beam, constructed by Stanford University physics professor K. H. Sherwin in 1964, four years after the laser was invented, to demonstrate to his classes how lasers work. The body (left), recycled from a toy raygun, holds a pencil size ruby rod and two flashtubes.(right). It is attached by wire to a 200 watt-second high voltage power supply. When the trigger is pulled, the flashtubes go off, creating a pulse of red laser light from the rod. The coherent light pulse is powerful enough to pop a blue balloon (shown at left); but not a red one, since it reflects the red light. Alterations to image: cleaned up some dark areas around the circuit board on the left that looked to be artifacts from the page scan. |
Date | |
Source | Retrieved June 4, 2015 from K. H. Sherwin, "Laser gun sparks lectures" in Popular Science magazine, Popular Science Publishing Co., New York, Vol. 185, No. 5, November 1964, p. 64 on Google Books |
Author | K. H. Sherwing |
Permission (Reusing this file) |
This 1964 issue of Popular Science magazine would have the copyright renewed in 1992. Online page scans of the Catalog of Copyright Entries, published by the US Copyright Office can be found here. Search of the Renewals for Periodicals for 1978 and later show no renewal entries for Popular Science. Therefore the copyright was not renewed and it is in the public domain. |
Licensing
[edit]Public domainPublic domainfalsefalse |
This work is in the public domain because it was published in the United States between 1929 and 1963, and although there may or may not have been a copyright notice, the copyright was not renewed. For further explanation, see Commons:Hirtle chart and the copyright renewal logs.
Note that it may still be copyrighted in jurisdictions that do not apply the rule of the shorter term for US works (depending on the date of the author's death), such as Canada (70 years p.m.a.), Mainland China (50 years p.m.a., not Hong Kong or Macao), Germany (70 years p.m.a.), Mexico (100 years p.m.a.), Switzerland (70 years p.m.a.), and other countries with individual treaties. العربية ∙ Deutsch ∙ English ∙ español ∙ français ∙ galego ∙ italiano ∙ 日本語 ∙ 한국어 ∙ македонски ∙ português ∙ português do Brasil ∙ русский ∙ sicilianu ∙ slovenščina ∙ українська ∙ 简体中文 ∙ 繁體中文 ∙ +/− |
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 09:00, 4 June 2015 | 564 × 257 (26 KB) | Chetvorno (talk | contribs) | User created page with UploadWizard |
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