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Knight's Mechanical Encyclopedia (ed. Knight), G. (search)
ather stretched over a wooden frame, and revolved from four to eight hours. The ingredients are incorporated by placing the charcoal and sulphur together in a rolling barrel, similar to that in which the sulphur is pulverized, and rolling them for one hour. The saltpeter is then added and rolled for three hours longer, after which the mixture is transferred to the cylinder or rolling mill, which consists of two cast-iron cylinders rolling in a circular trough with a cast-iron bottom. At Waltham, the saltpeter, brimstone, and charcoal are ground separately in mills, each consisting of a pair of heavy circular stones slowly revolving on a stone bed. Next the ingredients are conveyed to the mixing-house. Here, in bins, are the saltpeter, brimstone, and charcoal, weighed in the exact proportions: saltpeter, 75; brimstone, 10; and charcoal, 15; in every 100 parts. Of the three ingredients, forty-two pounds are placed in a hollow drum, which revolves rapidly, and contains a flypan, whi
Knight's Mechanical Encyclopedia (ed. Knight), W. (search)
at Roxbury, Mass.; but the site being found unsuitable, on account of the dust, the establishment was in 1854 removed to Waltham, where it still remains, its products constituting the Waltham watches of the American watch Company, now so generally aWaltham watches of the American watch Company, now so generally and favorably known. The factory is located at Waltham, is on the banks of the Charles River, and is a chain of buildings, roofing nearly two acres, and inclosing a flower-garden. The company's product amounts to about $1,500.000 per year. It tuWaltham, is on the banks of the Charles River, and is a chain of buildings, roofing nearly two acres, and inclosing a flower-garden. The company's product amounts to about $1,500.000 per year. It turns out commonly about 350 movements a day, or 105,000 per year, and 4,000 silver cases a month; in the production of which about 900 workpeople are employed, half of them women. The underlying principle which gives their excellence to these watc screws from a continuous length of wire. Admirable examples are to be found in the American Watch Company's works at Waltham, where jewel and other screws are made by perfectly automatic operations from wire fed from spools. Fig. 7276 shows o