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Knight's Mechanical Encyclopedia (ed. Knight) 6 0 Browse Search
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Knight's Mechanical Encyclopedia (ed. Knight), C. (search)
so prearranged that the salient portion of each cam advances to give color to its appropriate prism, while the others pass by uncolored. 10, 11, 12, are ordinary printing-rolls, which may be auxiliary to the prismatic colorers. A is the main cylinder which carries the end apron on which the cloth passes from the pay-off roller, past the printing, and thence to the dryer or ageing-loft. Cal′i-duct. A pipe for conveying hot water or steam for heating purposes. A term given by Cardinal Polignac, 1713, to the pipes, etc., in which air was heated by the adjacent fire, and from which the air passed into the room. They were used by the ancient Romans (see hypocaust), and in the Arab palaces of Cordova, in Spain, about A. D. 1000, being imbedded in the walls, and carrying the heat of the hypocaust to the apartments in winter. Ca′lin. An alloy of lead and tin, used by the Chinese as a lining for tea canisters and boxes. Calipers. Cal′i-pers. An instrument, jointe<
Knight's Mechanical Encyclopedia (ed. Knight), F. (search)
ere being removed. A pipe a communicated with the external air, and was closed, when required, by a damper. When the valve was opened, a brisk draft urged the fire. The flue was closed by an iron plate or register at c. Fireplaces. Cardinal Polignac, in 1715, published under the name of another man (Gauger's Treatise on the art of warming rooms ) an account of improved mechanical arrangements for fireplaces. This is shown at E in the figure. The hollow metallic case forming the back sides. Rumford contracted the fire-chamber and throat, and inclined the jambs. See coving. In 1745, Dr. Benjamin Franklin introduced a fireplace which he named the Pennsylvanian, in which Prince Rupert's descending flue was combined with Polignac's caliducts. This is shown at F. (Fig. 1997.) Count Rumford's improvements consisted mainly in the contraction of the chimney at the throat, the rounding of the breast-work, and the flaring of the covings, as illustrated in the accompanying