Fayl:Pierre and Marie Curie.jpg

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

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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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Faylning biror paytdagi holatini koʻrish uchun tegishli sana/vaqtga bosingiz.

Sana/VaqtMiniaturaOʻlchamlariFoydalanuvchiIzoh
joriy08:01, 14-May 201408:01, 14-May 2014 dagi versiya uchun tasvir2 163 × 1 740 (1,07 MB)Materialscientistcrop
07:57, 14-May 201407:57, 14-May 2014 dagi versiya uchun tasvir3 210 × 2 196 (1,9 MB)MaterialscientistOriginal
05:17, 27-Iyul 201205:17, 27-Iyul 2012 dagi versiya uchun tasvir2 982 × 2 186 (1 020 KB)Materialscientistbetter version
14:29, 2-Iyun 200814:29, 2-Iyun 2008 dagi versiya uchun tasvir2 624 × 1 640 (2,98 MB)CarlFromViennaEine manuell überarbeitete Version des bekannten Fotos. Details wurden nachgezeichnet zum Abdruck im Reclam-Heftchen nachbearbeitet (also nicht von mir).
18:28, 10-Aprel 200718:28, 10-Aprel 2007 dagi versiya uchun tasvir1 600 × 1 091 (161 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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