St. John, Thomas M. (Thomas Matthew), b. 1865 · New York, T. M. St. John · leaf 148
Fig. 222. invisible and are even given out where the cathode raysstrike the glass. Some chemical compounds are madeluminous by these rays; so screens are made and coatedwith them in order that the shadows produced by the … Fig. 223. X-rays can be seen by the eye. Professor Roentgennamed these the X-rays. Fig. 220-A shows ^fiuoroscopethat contains a screen covered with proper chemicals. 146 X-RAYS HUMAN BONES PHOTOGRAPHED. 159. X-Ray Photographs. Bone does not allow theX-rays to pass through it as readily as flesh, so…
Electricity
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