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File:Sibyl Rock Control Engineering 1955.jpg

Sibyl_Rock_Control_Engineering_1955.jpg (522 × 480 pixels, file size: 120 KB, MIME type: image/jpeg)

Description
English: Photograph of Sibyl M. Rock in the article "Sibyl Rock puts digits to work" in Control Engineering, February 1955, p. 11.

Mathematician Sibyl Rock is seated, smiling, in front of an ElectroData computer.

No copyright renewal. No author identified. No photographer identified.
Date
Source "Sibyl Rock puts digits to work" in Control Engineering, February 1955, p. 11.
Author No authors indicated in original
Permission
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Public domain
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.

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February 1955

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0.01666666666666666666 second

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5.7 millimetre

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image/jpeg

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Date/TimeThumbnailDimensionsUserComment
current00:16, 16 October 2013Thumbnail for version as of 00:16, 16 October 2013522 × 480 (120 KB)Mary Mark Ockerbloom{{Information |Description ={{en|1=Photograph of Sibyl M. Rock in the article "Sibyl Rock puts digits to work" in ''Control Engineering'', February 1955, p. 11. Mathematician Sibyl Rock is seated, smiling, in front of an Elect...

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