File:Pierre and Marie Curie.jpg

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Pierre and Marie Curie in the laboratory, demonstrating the experimental apparatus used to detect the ionsation of air, and hence the radioactivity, of samples of purified ore which enabled their discovery of radium.

Marie is operating the apparatus. With her right hand she is adding/subtracting known weights from a pan hanging from a strip of piezo-electric material which generates a very small elecrical charge (in the region of pico-amps) according to the weight hung on it. This is nulled against the charge accumulated on an ion chamber due to radioactivity. In her left hand she has a stopwatch to measure the rate of change of charge using a quadrant electrometer. When the weight is changed, the time elapsed for the charge to be nulled is measured by the stopwatch. The charge is indicated by a light spot on the scale in front of her projected by the quadrant electrometer, which is off the left of the picture.

Date circa 1904
date QS:P,+1904-00-00T00:00:00Z/9,P1480,Q5727902
Source hp.ujf.cas.cz (uploader=--Kuebi 18:28, 10 April 2007 (UTC))
Author Unknown

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The copyright of this image has expired in the European Union because it was published more than 70 years ago without a public claim of authorship (anonymous or pseudonymous), and no subsequent claim of authorship was made in the 70 years following its first publication.
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Date/TimeThumbnailDimensionsUserComment
current08:01, 14 May 2014Thumbnail for version as of 08:01, 14 May 20142,163 × 1,740 (1.07 MB)Materialscientist (talk | contribs)crop
07:57, 14 May 2014Thumbnail for version as of 07:57, 14 May 20143,210 × 2,196 (1.9 MB)Materialscientist (talk | contribs)Original
05:17, 27 July 2012Thumbnail for version as of 05:17, 27 July 20122,982 × 2,186 (1,020 KB)Materialscientist (talk | contribs)better version
14:29, 2 June 2008Thumbnail for version as of 14:29, 2 June 20082,624 × 1,640 (2.98 MB)Tischbeinahe (talk | contribs)Eine manuell überarbeitete Version des bekannten Fotos. Details wurden nachgezeichnet zum Abdruck im Reclam-Heftchen nachbearbeitet (also nicht von mir).
18:28, 10 April 2007Thumbnail for version as of 18:28, 10 April 20071,600 × 1,091 (161 KB)Kuebi (talk | contribs){{Information |Description=Pierre and Marie Curie in the laboratory. Prior 1907. |Source= hp.ujf.cas.cz (uploader=--~~~~) |Date=prior 1907, because Pierre Curie died in 1906 |Author=unknown }}
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