Science Abstracts: Electrical engineering abstracts. Section B, Volume 8

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Institution of Electrical Engineers., 1905 - Electric engineering
 

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Page 21 - ... of the air were published by the Atmospheric Products Company, whose method was invented by Bradley and Lovejoy (Electrical World and Engineer, Aug. 2, 1902). The apparatus used in carrying out this method consisted chiefly of a solid drum or cylinder with a large number of platinum points placed inside the drum. Within the drum another cylinder is placed with points outwards. When the outer or inner drum is rotating the points come close to each other. The drums are connected to opposite sides...
Page 26 - Equal parts of good hide glue and American isinglass, softened in water for ten hours and then boiled with pure tannin, until the whole mass is sticky. The surface of the joint should be roughened and the cement applied hot.
Page 20 - ... 3. Any' beneficial action of a reducing agent is probably due to the removal from the solution of dissolved oxygen. 4. A fine-grained deposit is favored by high current density and potential difference, by acidity and alkalinity, by low temperature, and by colloids. 5. Solutions containing oxidizing agents appear to yield small crystals while larger crystals are obtained from solutions containing reducing agents. 6. The adherence of deposits rests on the adhesion of the two metals.
Page 104 - ... joint was secured by three prisoners of an I-section on the outside face, by link prisoners on each edge, and by a dove-tailed bronze clamp on the inside, fitting over lugs on the rim. The arms were of phosphor bronze, twenty in number, ten on each side, and were a cross in section. These arms came midway between the rim joints' and were bolted to plane faces on the polygonal hub. The rim was further reinforced by a system of diagonal bracing, each section of the rim being supported at five points...
Page 366 - The ore was crushed, roasted and magnetically separated. The conclusion reached is that blende and marcasite in the concentrate tested "can be successfully separated by crushing through a 2o-mesh screen, roasting from five to ten minutes at a temperature not exceeding 600° C., and then subjecting to two double-pole magnets, the first having less than half the strength of the second.
Page 387 - They included efficient foundation brake-gear automatic slack adjuster, to maintain the minimum piston stroke in the brake cylinders, and brake beams hung between the wheels and adapted to regulate the brake-shoe pressure so as to compensate for the transfer of weight from the rear to the forward pair of wheels of each truck during the application of the brakes. In addition to such general considerations an exceedingly important element of braking efficiency is the character of the brakeshoes applied...
Page 20 - As persulphate of ammonium and hypochlorous acid are oxidizing agents, and hydrochinon and pyrogallol are reducing agents, it is difficult for me to see the derivation of the generalization. Some of the general results of Professor Bancroft's paper are: 1. "A bad deposit is always due to the precipitation with the metal of some salt or nonmetal.
Page 105 - ... midway between the rim joints' and were bolted to plane faces on the polygonal hub. The rim was further reinforced by a system of diagonal bracing, each section of the rim being supported at five points on each side, in such a way as to relieve it almost entirely from bending. The braces, like the arms, were of phosphor bronze, and all bolts and connecting links of steel. This wheel was designed by a Baltimore firm as a model of a proposed 30-foot fly-wheel. On account of the excessive air resistance...
Page 104 - The rim was 6^4 inches wide and 1% inch thick, and was built of ten segments, the material being steel casting. Each joint was secured by three prisoners of an I-section on the outside face, by link prisoners on each edge, and by a dove-tailed bronze clamp on the inside, fitting over lugs on the rim. The arms were of phosphor bronze, twenty in number, ten on each side, and were a cross in section. These arms came midway between the rim joints' and were bolted to plane faces on the polygonal hub.
Page 25 - A few words might be said here with reference to machinists' cements. These are the well-known red and white leads. The red lead is often diluted with an equal bulk of silica or other inert substance so as to make it less powdery on drying.

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