. A dictionary of arts, manufactures and mines : containing a clear exposition of their principles and practice. oughout, for which purpose merelysome of the coils of the bundle of wires are tried. Those that are too thick are returnedto the wire-drawer, or set apart for another size of needles. The first operation, properly speaking, of the needle factory, is unwinding the bundlesof wires. With this view the operative places the coil upon a somewhat conical reel,fig. 750, whereon he may fix it at a height proportioned to its diameter. The wire iswound off upon a wheel b, formed of eight equal
. A dictionary of arts, manufactures and mines : containing a clear exposition of their principles and practice. oughout, for which purpose merelysome of the coils of the bundle of wires are tried. Those that are too thick are returnedto the wire-drawer, or set apart for another size of needles. The first operation, properly speaking, of the needle factory, is unwinding the bundlesof wires. With this view the operative places the coil upon a somewhat conical reel,fig. 750, whereon he may fix it at a height proportioned to its diameter. The wire iswound off upon a wheel b, formed of eight equal arms, placed at equal distances rounda nave, which is supported by a polished round axle of iron, made fast to a strongupright c, fixed to the floor of the workshop. Each of the arms is 54 inches long; and 886 NEEDLE MANUFACTURE. one of them, d, consists of two parts; of an upper part, which bears the cross bar E, towhich the wire is applied; and of an under part, connected with the nave. The part eslides in a slot in the fixed part f, and is made fast to it by a peg at a proper height for 751 ?^ BcpD -t. 754 placing the ends of all the spokes in the circumference of a circle. This arrangement isnecessary, to permit the wire to be readily taken ofl the reel, after being wound tightround its eight branches. The peg is then rernoTcd, the branch pushed down, and thecoil of wire released. Fig. 751 shows the wheel in profile. It is driven by the winch-Handle G. The new made coil is cut in two points diametrically opposite, either by hand shear^of which one of the branches is fixed in a block by a bolt and a nut, as shown in_^g. 752,or by means of the mechanical shears, represented inyig. 753. The crank a is moved bya hydraulic wheel, or steam power, and rises and falls alternately. The extremity ofthis crank enters into a mortise cut in the arm b of a bent lever b g c, and is made fastto it by a bolt. An iron rod d r, hinged at one of its extremities to the end of the armc, and at
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Keywords: ., bookcentury1800, bookdecade1840, booksubje, booksubjecttechnology
