The Mechanic's Magazine, Museum, Register, Journal and Gazette, Volumen 32Robertson, 1840 |
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Página 15
... object , and his first operations were to drain the moss , and to plough , marl and manure the portion marked out for cultivation : he has also nearly surrounded the land with planta- tions consisting principally of Fir , Larch , Poplar ...
... object , and his first operations were to drain the moss , and to plough , marl and manure the portion marked out for cultivation : he has also nearly surrounded the land with planta- tions consisting principally of Fir , Larch , Poplar ...
Página 18
... object . " 3. To keep vessels clear of their anchor . " 4. To assist vessels in casting or wind- ing , and backing astern . " 5. To enable a vessel to be steered independent of the rudder , should it be dis- abled . " 6. To assist ...
... object . " 3. To keep vessels clear of their anchor . " 4. To assist vessels in casting or wind- ing , and backing astern . " 5. To enable a vessel to be steered independent of the rudder , should it be dis- abled . " 6. To assist ...
Página 20
... object was , by placing the pens and the polishing materials in a bag , and shak- ing them for an hour or two ; this , though a tolerably efficient , was never- theless a very tedious operation , and it was soon superseded by a metallic ...
... object was , by placing the pens and the polishing materials in a bag , and shak- ing them for an hour or two ; this , though a tolerably efficient , was never- theless a very tedious operation , and it was soon superseded by a metallic ...
Página 23
... object worth considering in those engines . Everything has been tried to obtain the utmost quantity of power of which a steam- engine is capable . Some have perfected valves , others produce a better vacuum , & c . & c . , because it ...
... object worth considering in those engines . Everything has been tried to obtain the utmost quantity of power of which a steam- engine is capable . Some have perfected valves , others produce a better vacuum , & c . & c . , because it ...
Página 31
... object for which the metal is required , whether " bolts " or " sheathing . " It is subsequently submitted to heat , and when , as it appears to us , of a " cherry red , " is worked in the cylinders or rollers , or drawn out in rods ...
... object for which the metal is required , whether " bolts " or " sheathing . " It is subsequently submitted to heat , and when , as it appears to us , of a " cherry red , " is worked in the cylinders or rollers , or drawn out in rods ...
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Pasajes populares
Página 453 - Almighty's form Glasses itself in tempests; in all time, Calm or convulsed — in breeze or gale or storm, Icing the pole, or in the torrid clime, Dark-heaving, boundless, endless and sublime — The image of eternity — the throne Of the Invisible; even from out thy slime The monsters of the deep are made; each zone Obeys thee; thou goest forth, dread, fathomless, alone.
Página 89 - Lavoisier from thinking any such opinion warranted, that till he was prevailed upon to repeat the experiment himself, he found some difficulty in believing that nearly the whole of the two airs could be converted into water.
Página 90 - April, 1783, in which he reasons on the experiment of burning the two gases in a close vessel, and draws the conclusion, " that water is composed of dephlogisticated air and phlogiston, deprived of part of their latent heat."* The letter was received by Dr.
Página 89 - Priestley's 5th volume,* gave rise to this inquiry, at least in England ; Mr. Cavendish expressly refers to it, as having set him upon making his experiments. — (Phil. Trans. 1784, p. 126.) The experiment of Mr. Warltire consisted in firing, by electricity, a mixture of inflammable and common air in a close vessel, and two things were said to be observed : first, a sensible loss of weight ; second, a.
Página 93 - Cavendish's priority as he was, that Mr. Watt had ever heard of Mr. Cavendish's theory before he formed his own. Whether or not Mr. Cavendish had heard of Mr. Watt's theory previous to drawing his conclusions, appears more doubtful. The supposition that he had so heard, rests on the improbability of his (Sir Charles Blagden's,) and many others knowing what Mr. Watt had done, and not communicating it to Mr. Cavendish, and on the omission of any assertion in Mr. Cavendish's paper, even in the part...
Página 91 - Cavendish leaves it uncertain, whether or not he meant by phlogiston simply inflammable air, and he inclines rather to call inflammable air, water united to phlogiston. Mr. Watt says expressly, even in his later paper (of November 1783), and in a passage not to be found in the letter of April 1783, that he thinks that inflammable air contains a small quantity of water, and much elementary heat. It must be admitted that such expressions as these on the part of both of those great men, betoken a certain...
Página 384 - Judge not the Lord by feeble sense, But trust Him for His grace ; Behind a frowning providence He hides a smiling face. Blind unbelief is sure to err And scan His work in vain ; God is His own interpreter, And He will make it plain.
Página 222 - No person shall adopt any such registered design on any article of manufacture for sale, either wholly or partially, by making any addition to any original part thereof, or by making any subtraction from any original part thereof: And if any person commit any such act, he shall for every offence forfeit a sum not less than five pounds and not exceeding thirty pounds, to the proprietor of the design, in respect of which such offence has been committed.
Página 363 - The amendment was then withdrawn, and the bill was read a second time, and ordered to be referred to a select committee. MODE OF CONDUCTING MINES IN BELGIUM. At a recent meeting of the " Scientific Society," the secretary read a communication from Mr.
Página 22 - A TREATISE ON A BOX OF INSTRUMENTS, And the Slide Rule ; with the Theory of Trigonometry and Logarithms, including Practical Geometry, Surveying, Measuring of Timber, Cask and Malt Gauging, Heights, and Distances. By THOMAS KENTISH. In one volume. 12mo.