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Knight's Mechanical Encyclopedia (ed. Knight), S. (search)
ical spring has coils of decreasing diameter as they approach the center, like the mainspring of a watch. (See movement, Fig. 3246.) The spiral spring is used in Salter's balance and in dynamometers; also in bedstead-springs, as in Fig. 623, page 261. Fig. 5418 shows a double helical bedstead-spring, the coils increasing upwar. Spring-bal′ance. A balance in which the weight of an object is determined from the tension or compression of a spring provided with an index and scale. Salter's spring-balance. In Salter's spring-balance, the spring is spiral and inclosed in a cylindrical box, at whose upper end is a suspending ring. The hook from Salter's spring-balance, the spring is spiral and inclosed in a cylindrical box, at whose upper end is a suspending ring. The hook from which the object to be weighed is suspended is connected by a rod to a piston above the spring, so that the weight has the effect of condensing the spring, a finger on the rod projecting through a long slot in the case and indicating the weight upon a graduated and numbered scale. In Martin's modification, the interior rod is f