Robertson screw ad



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English: Promotional card for the Robertson screw, which promotes the invention as the most recent advancement on Archimedes' screw
Date 1909(1909)
Source Collections Canada
Author Library and Archives Canada, Collections Canada website; from Ken Lamb (1998), P.L., inventor of the Robertson screw, Milton Historical Society. ISBN 0969562969.; original illustration Peter L. Robertson, 1909
(Reusing this file)
Public domain This work is in the public domain in the United States because it was published (or registered with the U.S. Copyright Office) before January 1, 1923.

Public domain works must be out of copyright in both the United States and in the source country of the work in order to be hosted on the Commons. If the work is not a U.S. work, the file must have an additional copyright tag indicating the copyright status in the source country.

The immediate source, the Collections Canada website, notes that this is in the public domain, but includes an apparently non-binding request for conditions of its reuse:] “Library and Archives Canada is identified as the source; You exercise due diligence in ensuring the accuracy of the material reproduced; You do not manipulate and/or modify the material reproduced; and The reproduction is not represented as an official version of the material reproduced or as having been made in affiliation with, or with the endorsement of, Library and Archives Canada.”[1]

Public Domain


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EXIF data:
File name robertson_screw_ad.jpg
Size, bytes 69526
Mime type image/jpeg
Orientation of image 1
Image resolution in width direction 150/1
Image resolution in height direction 150/1
Unit of X and Y resolution 2
Color space information 65535
Exif image width 600
Exif image length 363
Software used Adobe Photoshop CS Windows
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