The Mechanics' Magazine and Journal of Engineering, Agricultural Machinery, Manufactures and Shipbuilding, Band 77

Robertson, Brooman, & Company, 1862

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Seite 84 - It is hardly necessary to add that anything which any insulated body, or system of bodies, can continue to furnish without limitation, cannot possibly be a material substance; and it appears to me to be extremely difficult, if not quite impossible, to form any distinct idea of anything capable of being excited and communicated in the manner the Heat was excited and communicated in these experiments, except it be MOTION.
Seite 35 - Let the solar rays fall upon a surface of sand ; the sand is heated, and finally radiates away as much heat as it receives; let the same beams fall upon a forest, the quantity of heat given back is less than...
Seite 141 - THE ENGINEER'S, MILLWRIGHT'S, and MACHINIST'S PRACTICAL ASSISTANT ; comprising a Collection of Useful Tables, Rules, and Data. Compiled and Arranged, with Original Matter, by W. TEMPLETON. 5th Edition. i8mo, 2s.6d. cloth. " So much varied information compressed into so small a space, and published at a price which places it within the reach of the humblest mechanic, cannot fail to command the sale which it deserves. With the utmost confidence we commend this book to the attention of our readers."...
Seite 36 - In 1845 he published his Memoir on " Organic Motion," and applied the mechanical theory of heat in the most fearless and precise manner to vital processes. He also embraced the other natural agents in his chain of conservation. In 1853 Mr.
Seite 13 - ... idea of devoting the Friday evenings after Easter of the present year to discourses on the various agencies on which the material strength of England is based. He wished to make iron, coal, cotton, and kindred matters, the subjects of these discourses : opening the series by a discourse on the Great Exhibition itself; and he wished me to finish the series by a discourse on 'Force
Seite 36 - Alpine climber, are all cases of mechanical energy drawn from the sun. Not, therefore, in a poetical, but in a purely mechanical sense, are we children of the sun. Without food we should soon oxidize our own bodies.
Seite 36 - ... surface of sand ; the sand is heated, and finally radiates away as much heat as it receives ; let the same beams fall upon a forest, the quantity of heat given back is less than the forest receives, for the energy of a portion of the sunbeams is invested in building up the trees, in the manner indicated.
Seite 36 - Java' in 1840, that led Mayer to speculate on these subjects. He noticed that the venous blood in the tropics was of a much brighter red than in colder latitudes, and his reasoning on this fact led him into the laboratory of natural forces, where he has worked with such signal ability and success.
Seite 150 - SECTION 1. It shall not be lawful for the owner, operator or superintendent of any mine to employ any person or persons in such mine, or permit any person or persons to be in such mine for the purpose of working therein, unless...
Seite 177 - ... denuding action of the atmosphere has been unable, in most cases, to obliterate even the superficial traces of the glaciers, suggests the incompetence of that action to produce the same effect. That the glaciers have been the real excavators, seems to me far more probable than the supposition that they merely filled valleys which had been previously formed by water denudation. Indeed, the choice lies between these two suppositions : shall we assume that the glaciers filled valleys which were...

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