Cyclopedia of applied electricity: a general reference work on direct-current generators and motors, storage batteries, electrochemistry, welding, electric wiring, meters, electric light transmission, alternating-current machinery, telegraphy, etc, Volume 7 (Google eBook)

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American technical society, 1916 - Electric engineering
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Page 105 - This velocity is so nearly that of light, that it seems we have strong reason to conclude that light itself (including radiant heat, and other radiations if any) is an electromagnetic disturbance in the form of waves propagated through the electromagnetic field according to electromagnetic laws.
Page 119 - Here is unfolded to us a new and astonishing world one which it is hard to conceive should contain no possibilities of transmitting and receiving intelligence. Rays of light will not pierce through a wall, nor, as we know only too well, through a London fog. But the electrical vibrations of a yard or more in wave-length of which I have spoken will easily pierce such mediums, which to them will be transparent. Here, then, is revealed the bewildering possibility of telegraphy without wires, posts,...
Page 120 - What, therefore, remains to be discovered is, firstly, simpler and more certain means of generating electrical rays of any desired wave-length, from the shortest, say of a few feet in length, which will easily pass through buildings and fogs, to those long waves, whose lengths are measured by tens, hundreds, and thousands of miles; secondly, more delicate receivers, which will respond to wave-lengths between certain defined limits, and be silent to all others ; thirdly, means of darting the sheaf...
Page 119 - I have spoken will easily pierce such mediums, which to them will be transparent. Here, then, is revealed the bewildering possibility of telegraphy without wires, posts, cables, or any of our present costly appliances. Granted a few reasonable postulates, the whole thing comes well within the realms of possible fulfilment.
Page 97 - G is the galvanometer ; ww, are the wires along the banks, connected with copper plates,/, g, h, i, which are placed in the water. When this arrangement is complete, the electricity, generated by the battery, passes from the positive pole, p, to the plate h, across the river through the water to plate i, and thence around the coil of the galvanometer to plate /, across the river again to plate g, and thence to the other pole of the battery, N.
Page 120 - This is no mere dream of a visionary philosopher. All the requisites needed to bring it within the grasp of daily life are well within the possibilities of discovery, and are so reasonable and so clearly in the path of researches which are now being actively prosecuted in every capital of Europe, that we may any day expect to hear that they have emerged from the realms of speculation into those of sober fact.
Page 214 - ... sheaves similar to the method described for the horizontal hydraulic, and the motor, of course, is reversible. One of the principal features of this type of machine was the construction of the nut which traveled on this large screw. It was supplied with steel balls on the pull side of the screw, and they ran close together in single file through a channel, which carried them around through the threads of the nut and caused them to return to the other end of the same after they had passed through....
Page 253 - The gear used in this*machine is a spur of the "internal" type and, as the pinion usually Fig. 158. Internal Gear Type of Drive Courtesy of llaughton Elevator and Machine Company has a ratio of about 4 to 1, a high speed motor may be used. Of course when the reduction gear is used, the pinion is placed on the same shaft as the worm gear and the drum runs in separate bearings. The principal reason for the use of an internal spur gear is that it does not change the direction of the drum's rotation,...

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