The Mechanics' Magazine, Museum, Register, Journal, and Gazette, Band 30M. Salmon, 1839 |
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Seite 8
... amount of friction , and make it greater than the friction would be with fewer large axles ; besides greater expense and complexity , and extra trouble required to keep them in order . Mr. Whitelaw's plan for feeding steam- engine ...
... amount of friction , and make it greater than the friction would be with fewer large axles ; besides greater expense and complexity , and extra trouble required to keep them in order . Mr. Whitelaw's plan for feeding steam- engine ...
Seite 10
... amount to £ 78 88.in two years ? No guessing - show a theorem ! " Virgil's first known couplet ( and that by no means a very poetical one ) is said to have been posted on the gate of Augustus . And here we have the enthusiasm of a young ...
... amount to £ 78 88.in two years ? No guessing - show a theorem ! " Virgil's first known couplet ( and that by no means a very poetical one ) is said to have been posted on the gate of Augustus . And here we have the enthusiasm of a young ...
Seite 14
... amounts to 9-10ths for boats of eight tons . The quantity of water consumed is about two tons for eight tons of cargo , whereas in common locks it is about three tons of wa- ter per ton of cargo ; the saving is , there- fore , 22 parts ...
... amounts to 9-10ths for boats of eight tons . The quantity of water consumed is about two tons for eight tons of cargo , whereas in common locks it is about three tons of wa- ter per ton of cargo ; the saving is , there- fore , 22 parts ...
Seite 16
... amount to ten minutes , would compensate for the increased speed . He conceived that the chain might be ap- plied to a distance of three miles ; the time of crossing and the expense of the chain were the only limits . Mr. Parkes remark ...
... amount to ten minutes , would compensate for the increased speed . He conceived that the chain might be ap- plied to a distance of three miles ; the time of crossing and the expense of the chain were the only limits . Mr. Parkes remark ...
Seite 19
... amount of elongation may the several kinds of metal undergo before frac- ture ? 5. Does the amount of constriction or di- minution of area , at the section of fracture , bear any relation to the absolute strength of the metals , to the ...
... amount of elongation may the several kinds of metal undergo before frac- ture ? 5. Does the amount of constriction or di- minution of area , at the section of fracture , bear any relation to the absolute strength of the metals , to the ...
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acid apparatus appears applied atmosphere bitumen boat boiler camera obscura carbonic acid carriage cause centre charcoal coal colour common consequence construction crucible cylinder diameter effect employed engine equal experiments feet fire fixed fluid force friction fuel furnace Galignani Grand Western Canal 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 minute mode motion 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-engine stove strength sufficient surface tained temperature tenacity thermometer thick tion trials tube vapour vessel W. A. Robertson weight wheel zinc
Beliebte Passagen
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 59 - Europe, navigated by persons possessed of a knowledge of seamanship. In this country steam navigation produces hardy seamen, and British steamers being exposed to the open sea in all weathers, are furnished with masts and sails, and must be worked by persons, who, in the event of any accident happening to the machinery, are capable of sailing the vessel, and who must therefore be experienced seamen. The case is very different in America, where, with the exception of the vessels navigating the Lakes,...
Seite 406 - We shall find (especially if the paper has been kept some weeks before the trial is made) that its sensibility is greatly diminished, and, in some cases, seems quite extinct. But if it is 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, I have succeeded in increasing its sensibility to the degree that is requisite...
Seite 236 - Nor when cold Winter keens the brightening flood, Would I weak-shivering linger on the brink.
Seite 406 - This paper, if properly made, is very useful for all ordinary photogenic purposes. For example, nothing can be more perfect than the images it gives of leaves and flowers, especially with a summer sun : the light passing through the leaves delineates every ramification of their nerves.
Seite 343 - But if the picture so obtained is first preserved so as to bear sunshine, it may be afterwards itself employed as an object to be copied ¡and by means of this second process the lights and shadows are brought back to their original disposition.
Seite 338 - 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.
Seite 339 - But in truth the difficulty is in both cases the same. The one of these takes no more time to execute than the other ; for the object which would take the most skilful artist days or weeks of labour to trace or to copy, is effected by the boundless powers of natural chemistry in the space of a few seconds.
Seite 313 - And now about the cauldron sing, Like elves and fairies in a ring, Enchanting all that you put in. SONG. Black spirits and white, Red spirits and grey ; Mingle, mingle, mingle, You that mingle may.