The Mechanics' Magazine, Museum, Register, Journal, and Gazette, Band 30M. Salmon, 1839 |
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Seite 20
... relieved of the weights , to the horizontal position , when- ever the extension of the bar had allowed it to fall below that position , The latter method was , with very few ex- ceptions 20 REPORT OF THE COMMITTEE OF THE FRANKLIN INSTITUTE.
... relieved of the weights , to the horizontal position , when- ever the extension of the bar had allowed it to fall below that position , The latter method was , with very few ex- ceptions 20 REPORT OF THE COMMITTEE OF THE FRANKLIN INSTITUTE.
Seite 21
... method was , with very few ex- ceptions , adopted by the committee , -both because it allowed of a more exact deter ... methods were then pur- sued for the purposes of mutual verification . 1. A certain weight was placed in the pan ...
... method was , with very few ex- ceptions , adopted by the committee , -both because it allowed of a more exact deter ... methods were then pur- sued for the purposes of mutual verification . 1. A certain weight was placed in the pan ...
Seite 22
... method was employed ; the same for the second method ; and the ratio of the friction to the total weight sustained by the lever . A cor- rection is required particularly at the higher pressures , on account of the increased elas- ticity ...
... method was employed ; the same for the second method ; and the ratio of the friction to the total weight sustained by the lever . A cor- rection is required particularly at the higher pressures , on account of the increased elas- ticity ...
Seite 25
... method of obtaining the areas of transverse sections at the points of fracture . As the greater number of experiments was , of course , made on materials manu- factured expressly for steam boilers , the mode of preparing these is of ...
... method of obtaining the areas of transverse sections at the points of fracture . As the greater number of experiments was , of course , made on materials manu- factured expressly for steam boilers , the mode of preparing these is of ...
Seite 30
... method of conveying the power from the crank to the working axle of the driving - wheels , by means of tooth and ... methods may be advantageously em- ployed for transmitting , and for varying of motion , but it is only in a very few ...
... method of conveying the power from the crank to the working axle of the driving - wheels , by means of tooth and ... methods may be advantageously em- ployed for transmitting , and for varying of motion , but it is only in a very few ...
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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.