American Mechanics' Magazine, Band 2

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J. V. Seaman, 1825
 

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Seite 130 - As human Nature's broadest, foulest blot, Chains him, and tasks him, and exacts his sweat With stripes, that Mercy with a bleeding heart Weeps when she sees inflicted on a beast. Then what is man ? And what man seeing this, And having human feelings, does not blush And hang his head, to think himself a man...
Seite 223 - Walk but a quarter of an hour in your garden when the sun shines, with a part of your dress white, and a part black; then apply your hand to them alternately, and you will find a very great difference in their warmth. The black will be quite hot to the touch, the white still cool.
Seite 226 - Silhet, the nuts of the semecarpos anacardium, and the berries of the holigarna longifolia, having been steeped for a month in clear water, are cut transversely, and pressed in a mill. The expressed juice of each is kept for several months, taking off the scum from time to time. Afterwards the liquor is decanted, and two parts of the one are added to one of the other, to be used as varnish.
Seite 109 - ... result a more or less rapid flow from the orifice at the bottom of the trough ; and the less force the water has as it escapes, the more it will have employed in moving the machine, and consequently in producing the useful effect for which it is destined. The moving power is the weight of the water running in, multiplied by the height of the reservoir from which it flows above the bottom of the trough : and the useful effect is the same product diminished by half the force which the water retains...
Seite 118 - ... cubic feet of cold atmospherical air admitted into the furnace, which so cooled the heated gases, &c. that, however complete the plan was in other respects, the smoke could not possibly inflame from being so cooled, till a considerable time after the fire-door was shut. " To obviate this, I have adopted a cast-iron hopper above the fire-door, with a type at the bottom that has two pivots at one side, and opens at the other; one pivot goes through the end of the hopper, and has a counter lever...
Seite 247 - Nicole, do hereby declare that the nature of my said Invention, and the manner in which the same is to be performed, are...
Seite 151 - Improved Process of Hardening Steel.— Articles manufactured of steel for the purposes of cutting, are, almost without an exception, hardened from the anvil ; in other words, they are taken from the forger to the hardener without undergoing any intermediate process ; and such is the accustomed routine, that the mischief arising has escaped observation. The act of forging produces a strong scale or coating, which is spread over the whole of the blade...
Seite 75 - The instrument may be turned in declination with the finger, and round the polar axes with still less force. The most perfect motion round the polar axes is produced by means of clock-work, which is the principal feature of this instrument, and the greatest triumph for the artist, the mechanism being as simple as it is ingenious. A weight, attached to a projection connected with an endless screw, overcomes the friction of the machine.
Seite 236 - When it is wished to spot the horn in imitation of tortoise shell, metallic solution, must be employed, as follows. To spot it red, a solution of gold in aqua regia must be employed ; to spot it black, a solution of silver in nitric acid must be used ; and for brown, a hot solution of mercury in nitric acid. The right side of the horn must be impregnated with these solutions, and they will assume the colours intended. The brown spots can be produced on the horn by means of a paste made of red lead,...
Seite 223 - ... rather too hard than soft, for use will reduce the temperature : or if at any time it is necessary to perform the operation yourself, the best method I can recommend, is to melt a sufficient quantity of lead to immerse the cutting part of the tool. Having previously brightened its surface, plunge it into the melted lead for a few minutes, till it gets sufficiently hot to melt a candle, with which rub its surface, then plunge it in again, and keep...

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