This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1884 Excerpt: ...of the two, generally the induced circuit, has imparted to it a very rapid movement of rotation in the magnetic field of the inductor, and it is the mechanical work expended in moving it that is transformed into electricity. The former frictional machines also transformed mechanical work; but they only served to ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1884 Excerpt: ...of the two, generally the induced circuit, has imparted to it a very rapid movement of rotation in the magnetic field of the inductor, and it is the mechanical work expended in moving it that is transformed into electricity. The former frictional machines also transformed mechanical work; but they only served to multiply charges of staticelectricity--that is to say, to raise the potential at the two ends of an open circuit, and not to maintain a continual flow of dynamic electricity in a closed circuit. At first the inductors were composed of permanent magnets; as the power of these magnets is limited, and as thenweight and dimensions increase in greater proportion than the power, to increase the power of these machines, electro-magnets were employed in which an electric current develops an enormously greater amount of magnetism than a permanent magnet of the same dimensions could contain. According to this difference in the inductors, the machines are ranged in two categories: magneto-electric machines, in which the inductors are permanent magnets; and dynamo-electric, in which electro-magnets are the inductors. This classification, which is sanctioned by usage, is inexact, because magnetism and motion play the same role in both classes, and because there is no magneto-electric machine which may not become dynamo-electric by the simple change of inductors, and nice versa. In the first machines of the dynamo-electric type, the current necessary to produce and sustain the magnetism of the inductors was furnished by a small auxiliary magneto-electric machine. This was the first application of exciting-machines. The system was soon simplified by the use of two separate circuits, the current in one of which excited the field magnets, while that in the other per...
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Seller's Description:
G+ (Shows moderate wear to edges, esp. at head and heel of spine with tiny tears there; some soiling or aging to edges of book block; interior surfaces are crisp and clean. ) Forest green pebbled cloth, gilt letters on spine, 458 pp. plus ads, 252 BW woodcuts. An outstanding history of something we take for granted. Originated in French by Emile Alglave and J. Boulard; translated here by T. O'Conor Sloane and edited with notes by C. M. Lungren. As fascinating as the text may be, what really stands out here are the BW woodcut illustrations--of scenes (like B. Franklin and his kite) and of intricate machinery and such. A terrific find, and quite rare.
