The Mechanics' Magazine, Museum, Register, Journal, and Gazette, Band 30M. Salmon, 1839 |
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Seite 2
... give Mr. J. D. Parry's description of " an ex- cellent fire - escape , " kind and judicious consideration , I must be permitted to ob- serve , that his ideas upon the subject generally , are somewhat crude , and that he might peruse the ...
... give Mr. J. D. Parry's description of " an ex- cellent fire - escape , " kind and judicious consideration , I must be permitted to ob- serve , that his ideas upon the subject generally , are somewhat crude , and that he might peruse the ...
Seite 6
... water , Lucar says : - " I may recite an infinite number of other examples which will prove the necessary use of water . and the diverse qualities of ANCIENT FIRE ENGINE . 231 The author does not give 6 ANCIENT FIRE - ENGINE .
... water , Lucar says : - " I may recite an infinite number of other examples which will prove the necessary use of water . and the diverse qualities of ANCIENT FIRE ENGINE . 231 The author does not give 6 ANCIENT FIRE - ENGINE .
Seite 7
... give an account of the operations of the different parts of the machine , it appears , however , ( as mentioned in the above pamphlet ) to con- sist of a kind of hollow cone , moveable on a wooden frame , and open at the ver- tex C ...
... give an account of the operations of the different parts of the machine , it appears , however , ( as mentioned in the above pamphlet ) to con- sist of a kind of hollow cone , moveable on a wooden frame , and open at the ver- tex C ...
Seite 23
... give = 0.606 The 6th and 8th give x = The 7th and 17th give x = The 8th and 10th give x = The 10th and 12th give x = The 11th and 18th give x = The 13th and 15th give x = The 2nd and 17th give = 0.625 Hence the mean of the above 10 ...
... give = 0.606 The 6th and 8th give x = The 7th and 17th give x = The 8th and 10th give x = The 10th and 12th give x = The 11th and 18th give x = The 13th and 15th give x = The 2nd and 17th give = 0.625 Hence the mean of the above 10 ...
Seite 25
... give a perfect uniformity of structure , and as consequently the results on very deeply filed sections would not al- ways prove uniform in their indications of strength , it became necessary , in order at once to remove the ...
... give a perfect uniformity of structure , and as consequently the results on very deeply filed sections would not al- ways prove uniform in their indications of strength , it became necessary , in order at once to remove 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.