. The Annual of scientific discovery: or, Year-book of facts in science and art. Industrial arts -- Yearbooks; Science -- Yearbooks. MECHANICS AND USEFUL ARTS. 93 to the action of a mincing cylinder, somewhat similar to that used by paper makers for the conversion of rags into pulp ; afterwards, the whole is thoroughly cleaned in cold water tanks; and when the gutta- percha is found to be very impure, which is frequently the case as an article of commerce, a solution of common soda or chloride of lime is added to the water. From the cold water tanks the material is con- veyed to the masticatin
. The Annual of scientific discovery: or, Year-book of facts in science and art. Industrial arts -- Yearbooks; Science -- Yearbooks. MECHANICS AND USEFUL ARTS. 93 to the action of a mincing cylinder, somewhat similar to that used by paper makers for the conversion of rags into pulp ; afterwards, the whole is thoroughly cleaned in cold water tanks; and when the gutta- percha is found to be very impure, which is frequently the case as an article of commerce, a solution of common soda or chloride of lime is added to the water. From the cold water tanks the material is con- veyed to the masticating machine, in which it is secured by the doors being bolted down. By this operation it is subjected to very great pressure, and this part of the process is the same as that used in the manufacture of caoutchouc. From the masticating machine it is ^5 passed between large metal rollers, and thus converted into extensive sheets, of thicknesses regulated by the distance between the rollers. Sometimes it is passed two or three times between the rollers. These sheets are cut into bands of various widths by vertical knives placed at the end of the web or cloth by which the sheets are moved away from the rollers. The sheets are either cut into the proper width for lathe bands, or are stamped out for shoe soles, and various other purposes. MANUFACTURE OF COMBS. THE greatest comb manufactory in the world is in Aberdeen, Scot- land ; it is that of Messrs. Stewart, Rowell & Co. There are 36 fur- naces for preparing horns and tortoise-shell for the combs, and no less than 120 iron screw presses are continually going in stamping them. Steam power is employed to cut the combs, and an engine of fifty horse power is barely sufficient to do the work. The coarse combs are stamped or cut out-- two being cut in one piece at a time, by a machine invented in England in 1828. The fine dressing combs and all small tooth combs, are cut bv fine circular saws, some so fine as to tt cut 40 teeth in the
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Keywords: ., bookcentury1800, bookdecade1850, booksubjectindustr, bookyear1853
