Big Bertha Thing positron (Image JPG 56K)
Cosmic Ray Series

Round photographic plates.

Another pair of tracks, arising simultaneously, from a common point. The two particles responsible, for these tracks, produce equal specific ionizations. The one leaving the track of greater curvature is an electron of 27 MeV energy. The one leaving the track of smaller curvature was apparently left, by a particle not then known to exist, a particle identical with the electron, except that it carries a positive charge. It is a 450 MeV positron.

From a book by
J.D.Stranathan Ph.D.,
Professor of Physics and Chairman of
Department, University of Kansas.
The "Particles" of Modern Physics.
(C) Copyright The Blakston Co. 1942

Big Bertha Thing forward

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Occams' Razor says the simplest explanation is usually right.

(C) Copyright Tony Lance 1997.
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