Elementary lessons in electricity and magnetism (1906)
Thompson, Silvanus P. (Silvanus Phillips), 1851-1916, Schwetzky, Otto H. L. [from old catalog] · Chicago, Thompson & Thomas · leaf 459
s not trans-parent to heat-rays,^ a strong soution of iodine-, ofvery dark color, is opaque to light rays, but quite trans-parent to heat rays Rays of heat and light are transverse CHAP. XIV.] ELECTRICITY AND MAGNETISM. 433 vibrations of the ether, those of heat having a longerperiodic time than… … Fig. 179. longitudinally, creating alternate compression andexpansion of the air.) No longitudinal vibrations ofthe ether have been discovered, unless Prof. Roentgenis right in his suggestion that the X-rays may possiblyconsist in such ethereal motion. The cathode rays, hesays, inpinging upon the…
Electricity · Magnetism
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