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Knight's Mechanical Encyclopedia (ed. Knight) 4 0 Browse Search
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Knight's Mechanical Encyclopedia (ed. Knight), E. (search)
cts and calculations that electro-magnetic engines never can come into general use except in cases where the power required is so small that the cost of material consumed is of no practical importance, and the situation of the machinery is such as to make it very desirable to have a prime mover without a furnace. According to Mr. Joule, the consumption of a grain of zinc, though forty times more costly than a grain of coal, produces only about one eighth of the same mechanical effect. Cazal's electro-magnetic machine resembles a flywheel, being a thick disk of soft iron cut into the shape of a gear-wheel and having a circumferential groove wound with insulated wire, whose ends are soldered to insulated thimbles, which, by means of tangent springs, introduce the battery current. Surrounding this magnetic wheel is a fixed, heavy iron ring insulated on its interior surface in a manner to present elevations corresponding to the teeth of the wheel. When the teeth of the wheel pa
Knight's Mechanical Encyclopedia (ed. Knight), S. (search)
e′ Mo′tor. A spring or engine attached to a sewing-machine as a driver. The example shows the application of a coil-spring as the moving power for ordinary domestic use. A frictionroller and a brake, governed by a foot-lever, are employed to adapt the motion of the machine to the work. There are many other modes, besides the one usual in factories, which consists of band connection with the usual shafting driven by an engine. See list, page 2115. The electro-magnetic automotor of M. Cazal may be hidden under a footstool. Four of Bunsen's elements are sufficient for driving an ordinary sewingmachine at a stated cost of sixteen cents per day. The apparatus itself has an iron pulley with an externally toothed rim, which revolves freely within a metallic ring, toothed similarly to the pulley, but on its internal surface, so that the points of the teeth of the pulley face and approximate to those of the outer circle. An insulated wire runs over the pulley, which thus becomes