The Mechanic's Magazine, Museum, Register, Journal and Gazette, Band 30Robertson, 1839 |
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Seite 9
... force , which may be acquired by increasing the tension of a spiral spring , similar to that of a common clock . The escape- ment of a common watch or clock is re- gulated by the constant action and re- action of the balance - wheel or ...
... force , which may be acquired by increasing the tension of a spiral spring , similar to that of a common clock . The escape- ment of a common watch or clock is re- gulated by the constant action and re- action of the balance - wheel or ...
Seite 11
... force , and to in- crease the leverage ; any power applied at its lower end causes the lever , b , to turn to- wards a vertical position , and at the same time , brings the others nearer to the same line . This , of course , forces the ...
... force , and to in- crease the leverage ; any power applied at its lower end causes the lever , b , to turn to- wards a vertical position , and at the same time , brings the others nearer to the same line . This , of course , forces the ...
Seite 18
... forces in the interior of steam boilers , it is obviously not less so , to under- stand aright the efficacy of those means on which we rely for confining or controlling their energies . Hence , in investigating the causes of explosions ...
... forces in the interior of steam boilers , it is obviously not less so , to under- stand aright the efficacy of those means on which we rely for confining or controlling their energies . Hence , in investigating the causes of explosions ...
Seite 19
... force which will produce a permanent elongation in a bar , and that which will entirely over- come its tenacity ? 4. What amount of elon ation may the several kinds of metal undergo before frac- ture ? 5. Does the amount of constriction ...
... force which will produce a permanent elongation in a bar , and that which will entirely over- come its tenacity ? 4. What amount of elon ation may the several kinds of metal undergo before frac- ture ? 5. Does the amount of constriction ...
Seite 20
... force acting vertically on its longer arm , with the advantage of ample strength and stiffness , combined with the condition of a theoretical lever , in respect to the gra- vity of parts . There are two modes of operating by which a bar ...
... force acting vertically on its longer arm , with the advantage of ample strength and stiffness , combined with the condition of a theoretical lever , in respect to the gra- vity of parts . There are two modes of operating by which a bar ...
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acid apparatus appears applied atmosphere boat boiler camera obscura carbonic acid carriage cause centre charcoal coal colour common consequence construction copper crucible cylinder diameter effect employed engine equal experiments feet fire fixed fluid force friction fuel furnace Galignani greater hour improvements inches invention iron latent heat length lever light Liverpool London machine machinery Magazine manufacture matrass matter means Mechanics ment Messrs metal method Metropolitan Railway miles minute mode motion muriatic acid object observed obtained paddle-wheel paddles paper pass patent PHOTOGENIC DRAWING piece pipe plate portion pounds present pressure produced Prussian blue purpose quantity rails Railway ratus render resistance road screw side six months specific gravity specific heat steam steam-engine stove strength sufficient surface tained temperature tenacity thermometer tion trials tube vapour vessel W. A. Robertson weight wheel zinc
Beliebte Passagen
Seite 415 - Archimedes; and he who perceived that the square of the hypotenuse of a right-angled triangle is equal to the sum of the squares of the other two sides, is not in consequence a Pythagorean.
Seite 284 - ... perfectly safe. But as it did not yet come up entirely to the inventor's expectations, he proceeded to contrive a third lamp, in which he proposed to surround the oil vessel with a number of capillary tubes. Then it struck him, that if he cut off the middle of the tubes, or made holes in metal plates, placed at a distance from each other, equal to the length of the tubes, the air would get in better, and the effect in preventing the communication of explosion would be the same.
Seite 244 - Nor when cold Winter keens the brightening flood, Would I weak-shivering linger on the brink.
Seite 346 - The images formed by means of a camera obscura have been found to be too faint to produce, in any moderate time, an effect upon the nitrate of silver.
Seite 348 - ... and may be fixed for ever in the position which it seemed only destined for a single instant to occupy.
Seite 7 - I will set before your eyes a type of a ' squirt' which hath been devised to cast much water upon a burning house, wishing a like squirt and plenty of water to be alwaies in a readinesse where fire may do harme ; for this kind of squirt may be made to holde an hoggeshed of water, or if you will, a greater quantity thereof, and may be so placed on his frame, that with ease and a smal strength, it sahl be mounted, imbased or turned to any one side, right against any fired marke, and made to squirt...
Seite 84 - As the three angles of a plane triangle are equal to two right angles, that is, to 180° (Euc, 32. 1.) the' sum of any two of them is the supplement of the other.
Seite 185 - Sir, — Permit me, through the medium of your Journal, to call the attention of engineers on railways to the very erroneous method many of them adopt in setting out the curves, which, if intended to be segments of circular arcs — ought certainly to be so. Of course it must be generally known, from the great radii of even the least of the curves on railways — it would be impracticable to strike them, as in the usual manner, from a fixed centre; but from the known relation between the sine and...
Seite 414 - But if it be again washed with a liberal quantity of the solution of silver, it becomes again sensible to light, and even more so than it was at first. In this way, by alternately washing the paper with salt and silver, and drying it between times, Mr.
Seite 346 - The copy of a painting or the profile, immediately after being taken, must be kept in an obscure place ; it may, indeed, be examined in the shade, but in this case the exposure should be only for a few minutes ; by the Light of candles or lamps, as commonly employed, it is not sensibly affected.