File:Figure 9 of Radio-active substances.png

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Description Illustration from scan of Curie, Marie. Radio-active substances. London: Chemical News Office. 1904. Adjustments to original jp2 version of page: converted to greyscale and PNG, crop to content, black and white point levels to remove background.
Date
Source jp2.zip at https://archive.org/download/radioactivesubst00curi
Author Not determined
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This image is in the public domain because it is a mere mechanical scan or photocopy of a public domain original, or – from the available evidence – is so similar to such a scan or photocopy that no copyright protection can be expected to arise. The original itself is in the public domain for the following reason:
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This tag is designed for use where there may be a need to assert that any enhancements (eg brightness, contrast, colour-matching, sharpening) are in themselves insufficiently creative to generate a new copyright. It can be used where it is unknown whether any enhancements have been made, as well as when the enhancements are clear but insufficient. For known raw unenhanced scans you can use an appropriate {{PD-old}} tag instead. For usage, see Commons:When to use the PD-scan tag.


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Date/TimeThumbnailDimensionsUserComment
current06:39, 4 March 2016Thumbnail for version as of 06:39, 4 March 2016900 × 1,335 (212 KB)Cygnis insignis{{Information |Description=Illustration from scan of Curie, Marie. Radio-active substances. London: Chemical News Office. 1904. Adjustments to original jp2 version of page: converted to greyscale and PNG, crop to content, black and white point levels t...

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