The Electrical Age, Vol. 24

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Excerpt from The Electrical Age, Vol. 24: An Illustrated Weekly Electrical Journal, August December, 1899 Then I tried the effect of_ the rays when intersected by different substances. I placed a silver' dollar on the glass side of the plate, the dollar being covered by the deve10p ing solution, and held two fingers during ten minutes on the metal. The result was a distinct impression of the dollar without giving any detail of the stamp of the coin. The fingers touching the coin were not imprinted on the film. See Fig. 4. This indicates that the rays did not pass through the metal, but that their vibration was im parted to the metal, which then acted on the film. Then I placed, also on the glass side of a plate, two Silver dol lars and touched one of them. The result showed that the image of the dollar which I touched was imprinted on the film, while the other did not act at all. Next I tried a plate of fine silver in. Thick, 2 in. Wide and 3 in. Long and touched the same with three fingers. Though the silver plate was thin, the tips of my fingers were not impressed on the film, but an imprint of the whole plate was plainly visible. The impression, however, was not as strong as that obtained with the dollar, indicating that the force of the rays may be in proportion to the surface of the metal. Then I experimented with a round plate of lead of the size and thickness of a silver dollar. The result was the same as obtained with the coin, only that the imprint was fainter, suggesting that not all metals are equally affected by the rays. -in order to investigate if these rays can be conducted for some distance through the metal, I had soldered with lead to the center of the round lead plate a lead rod in. Thick and 10 in. Long. The soldering was done with lead to avoid the formation of a galvanic current by the contact of two different met als. I bent the rod about 4 in. Above the lead plate, held the bent part of the rod in my hand and kept the metal 10 minutes on the glass side of the photographic plate. The shape of the metal was not imprinted on the film, only a few irregular spots where the metal rested were visible, but it could be plainly seen that an action took place over the whole film. The negative became dark. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully, any imperfections that remain are intentionally left to preserve the state of such historical works.