File:Pierre and Marie Curie.jpg

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English: 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.

Polski: Pierre i Maria Skłodowska-Curie w laboratorium, demonstrujący eksperymentalny aparat służący do wykrywania jonizacji powietrza, a co za tym idzie radioaktywności, próbek oczyszczonej rudy, co umożliwiło im odkrycie radu. Maria obsługuje aparat. Prawą ręką dodaje/odejmuje znane ciężarki z patelni zawieszonej na pasku materiału piezoelektrycznego, który generuje bardzo mały ładunek elektryczny (rzędu pikoamperów) w zależności od ciężaru zawieszonego na nim. Jest on zerowany w stosunku do ładunku zgromadzonego w komorze jonowej z powodu radioaktywności. W lewej ręce trzyma stoper, aby zmierzyć szybkość zmiany ładunku za pomocą elektrometru kwadrantowego. Gdy ciężar jest zmieniany, czas, jaki upłynął do zerowania ładunku, jest mierzony przez stoper. Ładunek jest wskazywany przez świetlną plamkę na skali przed nią, wyświetlaną przez elektrometr kwadrantowy, który znajduje się po lewej stronie obrazu.

Date

circa 1904

Source

hp.ujf.cas.cz (uploader=--Kuebi 18:28, 10 April 2007 (UTC))

Author

Unknown photographer

Permission
(Reusing this file)

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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