Gill's technological [afterw.] Gill's scientific, technological & microscopic repository; or, Discoveries and improvements in the useful arts, a continuation of his Technical repository, by T. Gill, Volumen2 |
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acid acres afterwards AIKIN animal apparatus appears applied aqua fortis Arts astringent become black dye blue boiling bones bouillon Carpenter carriages cement charcoal cloth colour compound eye contained copper covered crayons cubit Dated decoction diluted dissolved Editor employed enamel eyes fanams fecula feet fire formed four furnace galls garden gelatine gilding glass gold ground heat hive hole improvements inches insect iron labour lamp-black larch larva larvæ lime linen liquor logwood madder manner manufacture means metal method microscope mixture muriate necessary nitric acid object obtained ounces oxide paper passing pennyweights perfectly piece placed plantations planted plate porcelain pounds prepared produced purpose quantity removed rubbing sand silk silver six months Society Soho foundry solution stone substance sufficient surface syphon thick tion trees tubes turpentine varnish vessel vitriol washed weight wool workmen
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Página 378 - ... in any part of Europe during the preceding two years, on Heat or on Light ; the preference always being given to such discoveries as shall, in the opinion of the President and Council, tend most to promote the good of mankind.
Página 379 - American funds, may be employed to augment the capital of this premium ; and that the interest of the sums by which the capital may from time to time be so augmented may regularly be given in money, with the two medals, and as an addition to the original premium, at each succeeding adjudication of it. And it is further my particular request, that those additions to the value of the premium arising from the occasional non-adjudications, may be suffered to increase without limitation.
Página 89 - Of this acid bleaching liquor, small quantities at a time are to be added to the half bleached lac solution, allowing the effervescence which takes place on each addition to cease before a fresh portion is poured in. This is to be continued until the lac, now white, separates from the liquor. The supernatant fluid is now to be poured away, and the lac is to be well washed in repeated waters, and finally wrung as dry as possible in a cloth.
Página 108 - I attribute to the deep ploughing, to the highly-jnanured state of the land, and to its being constantly kept clean and loose upon the surface, by means of the hoe ; and I firmly believe that when land is in this state, the weather in England can never be too hot for forest trees.
Página 230 - It is not, however, merely a saving of time that is gained by the use of the rolling press, the paper is made smoother than it would have been by beating, and the compression is so much greater, that a rolled book will be reduced to about five-sixths of the thickness of the same book if beaten. A shelf, therefore,, that will hold fifty books bound in the usual manner, would hold nearly sixty of such if bound in Mr.
Página 121 - As the Turkey-red dyers are the great consumers of the common soda of commerce, it occurred to me, about four months ago, that they might make their own alkali, by the cheap and simple process of decomposing muriate of soda by pearl-ash, and thus procure a liquor equally pure, without the tedious and expensive operation of bringing the soda to the state of crystal. I pointed out the following plan to a Turkey-red dyer here, who immediately put it in practice, and it is now gradually adopting by the...
Página 364 - ... be left rough. The silver is first annealed, and afterwards pickled in weak spirit of salt ; it is planished, and then scraped on the surface to be fitted on the copper. These prepared surfaces are anointed with a solution of borax, or strewed with fine powdered borax itself, and then confined in contact with each other, by binding wire. When they are exposed to a sufficient degree of heat, the flux causes the surfaces to fuse at the same time, and after they become cold, they are found firmly...
Página 73 - Artificial incubation is exceedingly useful in furnishing young fowls at those seasons when the hens will not sit, and, in some situations, to produce, or, as we may say indeed, to manufacture a great number of fowls in a small space.
Página 162 - ... the stone, so that there may be no plaits formed in it, and that it may be equally applied over its whole surface. Care must be taken so to fix the scraper, that it may bear steadily on the autographic paper, for if it removes it at all, it will change the place of pressure, and the lines will be doubled. There should be...
Página 89 - French polish; and there can be no doubt it would afford coloured lackers and varnishes of superior quality. In fine, the white lac varnish is generally applicable to the various purposes of other white hard spirit varnishes, and is to be used under the same conditions, and with the same management.