GUYE, Charles-Eugene and Charles Lavanchy, “Vérification expérimentale de la formule de Lorentz-Einstein par les rayons cathodiques de grande vitesse ", in Comptes Rendus, vol 161, no 3, 19 July 1915, the article on pp 52-55 in the (very slim, wartime) issue of pp 45-60. Offered with the original front wrapper, removed from a larger bound volume. GOOD copy. $175
“In 1915, Charles-Eugène Guye and Charles Lavanchy measured the deflection of cathode rays at 0.25c–0.5c. They used a tube with a cathode and anode in order to accelerate the rays. A diaphragm at the anode produced a beam which was deflected. A screen was placed at the end of the apparatus, at which the impacts were photographed by a camera. They subsequently computated the ratio of transverse electromagnetic mass mT and rest mass m0 indicated by the red and blue curve, and obtained good agreement with the Lorentz–Einstein formula...supplementing Neumann's result. Neumann's and Guye/Lavanchy's experiments were considered by many as conclusively proving the Lorentz-Einstein formula.--Wikipedia
“Experimental Confirmation of the Lorentz Einstein Formula for Highspeed Kathode Rays CE Guye and C Lavanchy Comptes Rendus 161 pp 62-65 July 19 1915. The experimental method here adopted is that of identical trajectories previously developed by CE Guye and S Ratnovsky see Abs 418 1910 A reproduction of the photographs is given A table of 25 determinations is appended and compared with the theories of Lorentz Einstein and of Abraham. The former is distinctly supported and not the latter,”--Science Abstracts, volume 18, 1915, #1453
“In the debate over the circumstances which led to a full understanding and acceptance of Einstein’s theory of relativity, historians have in particular investigated the role played by the attempts to corroborate relativity by experimental investigations. We report here on the replication in progress of the celebrated experiment performed on cathode rays by the Swiss physicist Charles-Eugène Guye and his assistant in their attempt to vindicate the relativistic mass formula...”--“Replication of Guye and Lavanchy’s experiment on the velocity dependency of inertia”, Jack Lacki and Yacin Karim.
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