An Introduction to Electricity (Google eBook)

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J.B. Lippincott, 1908 - Electricity - 429 pages
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Page 280 - ... or ought to be ; and for this purpose it will be sufficient to know the resistance of some one wire of known dimensions of each material ; the resistance of all other wires of that material can then be simply calculated, since that resistance is directly proportional to the length, and inversely proportional to the section, of the wire. Table IX. is a table of " specific resistances,
Page 350 - Suppose a figure, swimming in any conductor to turn so as to look along the (positive direction of the) lines, then if he and the conductor be moved towards his right hand he will be...
Page 241 - ... in a direction opposite to that in which the hands of a clock move, and...
Page 350 - Let the forefinger of the right hand point in the direction of the magnetic lines...
Page vii - ... land, and the hour of its destiny has struck. Thus the yellow journal. The Canadian takes things more quietly. He Is too busy Just now raking in American dollars to devote much time to questions of Imperial Interest. But when he does find leisure to dwell on the subject, he is apt to point out that there is another point of view from which it may be regarded. He says that a vey large percentage of these pioneers from over the border Is composed of returned Canadians; of settlers who were attracted...
Page 406 - Ritter (1791-1869) recognized that this electrochemical series also represented the arrangement of the metals in such an order that each...
Page 421 - It is curious that the first wave form of radiation known was initially considered to be due to an emission of corpuscles, and that the first type of the latter class of radiation was conversely mistaken for a peculiar kind of wave radiation " (Soddy, op. cit., pp. 13-14). It was also very surprising to discover that radium compounds give rise to a radio-active gaseous substance called the "Emanation...
Page 236 - First discovery of the deflection of the magnetic needle by the electric current...
Page 421 - X-rays like light are ether waves, and the difference seems to be that in the lower the disturbances are of the nature of sudden pulses very rapidly dying away, whereas in light there is a regular recession of undulations of the same kind.
Page 383 - In order to generate waves of 3 metres long, capable of being observed in a physical laboratory, the generating impacts should follow each other 100 million times in one second.

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