Datei:Pierre and Marie Curie.jpg

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Beschreibung

BeschreibungPierre and Marie Curie.jpg	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.
Datum	etwa 1904 date QS:P,+1904-00-00T00:00:00Z/9,P1480,Q5727902
Quelle	hp.ujf.cas.cz (uploader=--Kuebi 18:28, 10 April 2007 (UTC))
Urheber	Autor/-in unbekanntUnknown author

Public domain	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.	EU
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	Version vom	Maße	Benutzer	Kommentar
aktuell	09:01, 14. Mai 2014	2.163 × 1.740 (1,07 MB)	Materialscientist	crop
	08:57, 14. Mai 2014	3.210 × 2.196 (1,9 MB)	Materialscientist	Original
	06:17, 27. Jul. 2012	2.982 × 2.186 (1.020 KB)	Materialscientist	better version
	15:29, 2. Jun. 2008	2.624 × 1.640 (2,98 MB)	Blausonorisch	Eine manuell überarbeitete Version des bekannten Fotos. Details wurden nachgezeichnet zum Abdruck im Reclam-Heftchen nachbearbeitet (also nicht von mir).
	19:28, 10. Apr. 2007	1.600 × 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 }}