Dyer

One engaged in the busine of dyeing cloths, . Dy'er, in Indiana, a post-village of Lake co., abt. 30 m. E. of Joliet, III. Dy'er, in Tenne ee , a W. co., bordering on the Mi is sippi river; area , 495 sq. m. Rivers . Obion and Forked Deer rivers. Surface, level; soil , fertile. Cap . Dyersburg. Pop . (1890) 19,878. Dy'er Bay, in Maine, an arm of the Atlantic ocean, Dy'er Brook, in Maine, a post-office of A roos took co. extending into Hancock co. Dyersburg, in Tenne ee, a city, cap. of Dyer co., on Forked Deer river, 75 m. N.E. of Memphis. Pop . 2,100. Dyersville, I Iowa , a post-town of Dubuque co., about 302. W. of Dubuque. Pop . (1897) about 1,500. Dyer's weed, n. ( Bot .) See RESEDA. Dye's Mill, in Virginia , a former post-office of Fair that can be exerted by the human frame, animals or machinery, whether by a single effort of strength or by a continuous series of efforts exercised during any given time. In estimating the amount of work performed by any motive power by means of a machine contrived for the purpose, we have to consider the force that has been applied and the space through which this force has been exerted. If a horse pull a hundred-weight along a mile of level ground in half an hour, or half a hundred-weight over two miles in the same time, he will have performed the same amount of work in both cases; but if he continue to perform the same task for an hour in either case, it is manifest that he will have done double the quantity. We see, then, that the amount of work done must be estimated by the force applied to accomplish it, and the space of time for which the application of the force is kept up; in other words, it will be measured by the force exerted multiplied by the space of time through which it continues to act. To ascertain this with accuracy, a D. is required. The simplest kinds of these instruments are those used to determine the force which any man or animal can exert by a single effort. They vary considerably in form, as the force happens to be applied to the machine by tension or pre ure, or by striking it with the clenched fist to determine the weight of the blow that a person can deliver. The amount of power exerted is indicated by a needle moving along a horizontal or circular scale. Fig. 889 shows a D. constructed for trying the tenacity of a rod. It consists of a heavy iron frame, at one end of which is a box containing a stout steel spring. A pointer connected with this spring moves over a graduated arc on IMG:content-0695.png:[blocks in formation] the top of the box. On the frame are two movable blocks, or slides, one of which is attached to the spring, while the other may be carried backward and forward by a screw and crank. The rod whose tenacity is to be tried is stretched between the two slides, and the crank is then slowly turned so as to pull upon the rod until it breaks. The force upon the rod bends the spring; the pointer shows how much force it took to break the rod. (Mus.) The doctrine of the degrees of force in tone. Dyn'amism, n. The doctrine advanced by Leibnitz, that force is involved in all substances or bodies.