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I thought I would not reproduce these photographs here, because they did not seem to me to have come from Mr. Crookes himself.
Fig. 220 shows a Crookes tube fitted with a metal plate, so that the cathode rays coming from C will strike it.Things a Boy Should Know About Electricity|Thomas M. (Thomas Matthew) St. John
Crookes has represented this experiment by a sketch in his memoir upon this subject.
Crookes his ordinary, in those parsimonious dayes, had not a Capons-leg to throw at a dog.
Crookes attributed these rays to a very subtile matter charged with electricity and moving with a very great velocity.