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सञ्चिका:Pierre and Marie Curie.jpg

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वर्णनम्

Pierre and Maria Skłodowska-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.

Maria 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 (of the order of picoamperes) 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.
दिनाङ्क circa १९०४
date QS:P,+1904-00-00T00:00:00Z/9,P1480,Q5727902
स्रोतः hp.ujf.cas.cz (uploader=--Kuebi 18:28, 10 April 2007 (UTC))
लेखकः अनजानUnknown author

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१८:२८, १० एप्रिल् २००७१८:२८, १० एप्रिल् २००७ समये विद्यमानायाः आवृत्तेः अंगुष्ठनखाकारः१,६०० × १,०९१ (१६१ KB)Kuebi{{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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