Scientific Industries Explained: Showing how Some of the Important Articles of Commerce are MadeW. & H. K. Johnston, 1881 - 203 pagina's |
Overige edities - Alles bekijken
Scientific Industries Explained: Showing how Some of the Important ..., Volume 1 Alexander Watt Volledige weergave - 1881 |
Veelvoorkomende woorden en zinsdelen
acetic added afterwards alcohol allowed alloy alum ammonia aniline antimony becomes beer bleaching blue boiling bottle calcined called candles carbonate casks caustic charcoal chemical chloride clear liquor coal cold converted cool copper crucible crystals deposit Diluted dipped dissolved distillation drachm dried dyeing employed enamel essential oils evaporated Fahr fermentation filtered fire fumes furnace fused gallons glass gold grains gunpowder hydrochloric acid lamp-black lime liquid malt manufacture mass melted metal mixed mixture mordant Muriate naphtha nitre nitric acid obtained oil of vitriol operation ounces oxalic acid oxide paper pint placed plate potash potassa poured powder prepared proportion Prussian blue pure purple of Cassius rectified spirit removed retort sal-ammoniac salt small quantity soap soluble solution spirit of wine starch stirred substance sulphate of iron sulphate of soda sulphuric acid surface temperature tint tube varnish vessel vinegar washed yellow
Populaire passages
Pagina 134 - Majorca, who declares this admirable essence of wine to be an emanation of the Divinity, an element newly revealed to man, but hid from antiquity, because the human race was then too young to need this beverage, destined to revive the energies of modern decrepitude.
Pagina 165 - Robes and white veils," says he, " are painted in Egypt in a wonderful way. They are first imbued, not with dyes, but with dyeabsorbing drugs, by which, though they seem to be unaltered, yet, -when immersed for a little while in a cauldron of the boiling dye-liquor, they are found to become painted.
Pagina 91 - ... the needle, the graver, the spring of a watch or of a carriage, the chisel, the chain, the anchor, the compass, the cannon, and the bomb. It is a medicine of much virtue, and the only metal friendly to the human frame.
Pagina 60 - The glass is well cleaned, first with a cloth, after which a plug of cotton, dipped in the silvering fluid and a little polishing powder, is carefully passed over the surface to be silvered...
Pagina 60 - ... examined. The under surface presented a perfectly brilliant metallic plate of high reflective power, as high as any that silver can attain to; and the coat of silver, though thin, was so strong as to sustain handling, and so firm as to bear polishing on the back to any degree, by rubbing; with the hand and polishing powder. The usual course in practice, however, is, when the first stratum of fluid is exhausted, to remove it, and apply a layer of No. 2 solution ; and when that...
Pagina 60 - India-rubber stretched upon wood which has previously been cleaned and wetted with the solution ; in this manner a perfect wetting of the surface is obtained, and all air bubbles, &c., are removed.
Pagina 61 - It is easy to mend an injury in the silvering of a plate, and two or three cases of repair were performed on the table. The proposed advantages of the process are, — the production of a perfect reflecting surface ; the ability to repair ; the mercantile economy of the process (the silver in a square yard of surface is worth Is.
Pagina 190 - ... in., so as to leave a neat but scarcely perceptible margin. The varnishing of oil paintings is more properly effected by skill than by rule of thumb. The operation should be conducted in a warm room, perfectly free from dust. The picture should be laid flat on a level bench, and a small quantity of varnish poured on its centre; a flat soft brush is then taken, and with this the varnish is brushed over the surface, care being taken to avoid "brush-marks.
Pagina 84 - ... or little annealed, for bringing up lustre; and one very soft, or fully annealed, used before gilding, for removing the erasures which may have been made by the preceding tool, and for scratch-brushing after the gilding. Of course the...
Pagina 59 - ... glass, either in the form of plates or vessels. 1540 grains of nitrate of silver being treated with 955 grains of strong solution of ammonia, and afterwards with 7700 grains of water, yields a solution, to which when clear 170 grains of tartaric acid dissolved in 680 grains of water is to be added, and then 152 cubic inches more of water, with good agitation. When the liquid has settled, the clear part is to be poured off; 152 cubic inches of water to be added to the remaining solid matter, that...