The Mechanics' Magazine and Journal of Engineering, Agricultural Machinery, Manufactures and Shipbuilding, Tom 76

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Robertson, Brooman, & Company, 1862
 

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Strona 20 - ... one of the most important, and at the same time, one of the least expensive and troublesome, which we possess.
Strona 54 - Tis pleasant, through the loopholes of retreat, To peep at such a world ; to see the stir Of the great Babel, and not feel the crowd ; To hear the roar she sends through all her gates At a safe distance, where the dying sound Falls a soft murmur on the uninjured ear.
Strona 97 - Prime Movers,' p. 285, edit. 1859) that in the furnaces of locomotive engines, coal burns at from 1 Ib. in 30 seconds to 1 Ib. in 90 seconds per square foot of grate-bars. Hence heat is radiated from the sun at a rate not more than from fifteen to forty-five times as high as that at which heat is generated on the grate-bars of a locomotive furnace, per equal areas. The interior temperature of the sun is probably far higher than that at...
Strona 146 - You write two or three words on a paper ; he takes it with him into a room, and turns a machine enclosed in a cylindrical case, at the top of which is an electrometer, a small fine pith ball : a wire connects with a similar cylinder and electrometer in a distant apartment, and his wife by remarking the corresponding motions of the ball, writes down the words they indicate, from which it appears that he has formed an alphabet of motions. As the length of the wire makes no difference in the effect,...
Strona 36 - London, surveyor and engineer, for his invention of improvements in the means of, and in the apparatus for building and working under water, part of which improvements are applicable for other purposes.
Strona 146 - In electricity he has made a remarkable discovery; you write two or three words on a paper; he takes it with him into a room, and turns a machine enclosed in a cylindrical case, at the top of which is an electrometer, a small fine pith ball; a wire connects with a similar cylinder and electrometer in a distant apartment; and his wife, by remarking the corresponding motions of the ball, writes down the words they indicate; from which it...
Strona 193 - ... were complete, from red to violet, and very bright and distinct, especially where the mud was softest and moistest ; where a sheet of water, how thin soever, covered the mud, the iris vanished. No trace of an iris could be seen on the grass, in the sky, or anywhere but on the mud ; and on those parts of the turnpike road where the mud had been much disturbed no iris was visible.
Strona 122 - ... different heats ; the nature of the weld and its form, and the repeated cooling and re-heating of the plate, are also adverse to its possessing great toughness. The rolled plates have been found more uniform in quality and of greater toughness than the hammered ; and though the difficulties in their manufacture are grave, there is no departure from the ordinary practice followed in making large plates for other purposes. The difficulties which do exist are chiefly due to the immense weight and...
Strona 16 - Obviously the eye-service which the microscope requires trains the eye to minute and discriminative observation, and the hand to delicate accuracy. It leads on, if used scientifically, to the improvement of the scientific powers. The memory, the investigation of causes, the estimation of evidence, the power of distinguishing and of generalizing may be called into activity. But the mind has other and deeper needs than these. The senses lead to the awakening and culture of deeper powers inherent in...
Strona 97 - Section an application of these general views to the discovery of probable limits to the periods of time, past and future, during which the sun can be reckoned on as a source of heat and light. The subject was divided under two heads : 1. On the secular cooling of the sun ; 2. On the origin and total amount of the sun's heat.

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