The Mechanics' Magazine, Museum, Register, Journal, and Gazette, Band 30M. Salmon, 1839 |
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Seite 11
... direction of 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 ...
... direction of 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 ...
Seite 12
... directions the operation was proceeding , conducted me to the upper story , that he might convince me that there were no rents in the walls or ceil- ings of the rooms , I was astonished to find one of them filled with picture frames and ...
... directions the operation was proceeding , conducted me to the upper story , that he might convince me that there were no rents in the walls or ceil- ings of the rooms , I was astonished to find one of them filled with picture frames and ...
Seite 13
... direction in which its fibres lie ; so that the tendency to wear is very small . The blocks are coated with pitch or tar , and are set in sand , form- ing a smooth surface for carriages , which pass easily and noiselessly over it ...
... direction in which its fibres lie ; so that the tendency to wear is very small . The blocks are coated with pitch or tar , and are set in sand , form- ing a smooth surface for carriages , which pass easily and noiselessly over it ...
Seite 15
... direction of its length into three divisions , the middle being ap- propriated to the machinery , and each of the side divisions to carriages and traffic of all kinds . These side divisions have decks , raised from 2 feet to 2 feet 6 ...
... direction of its length into three divisions , the middle being ap- propriated to the machinery , and each of the side divisions to carriages and traffic of all kinds . These side divisions have decks , raised from 2 feet to 2 feet 6 ...
Seite 19
... directions of the rolling respec- tively ? 9. What influence may be produced , by long and repeated use , towards ... direction in which the strips are cut from the plate , to the breadth and thickness of the strips themselves , or to ...
... directions of the rolling respec- tively ? 9. What influence may be produced , by long and repeated use , towards ... direction in which the strips are cut from the plate , to the breadth and thickness of the strips themselves , or to ...
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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
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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.