dynamogeny (dinamojeni)

[ being made with a known weight or force that will over come the resistance of the raise the weight, or balance the friction. One of the simplest forms is a steelyard in which the force to be measured is applied to the IMG:content-0125.png:[blocks in formation] 20 20 shorter arm while a weight is balanced on the longer graduated arm. The most common form of spring-dynamometer consists of an elliptical spring that may be compre ed or pulled apart in the direction of its longer axis, with an index and scale, and sometimes a recording pencil, to indicate the amount of force exerted. In the apparatus depending on friction a brake is applied to the face of a pulley, and the force is measured by the resistance of the brake to the motion of the pulley. In other forms fast and loose pulleys are placed side by side and connected by weighted levers, a certain amount of force being required to lift the lever and communicate motion to both pulleys. In still other forms coiled springs are used to test a direct strain, as in moving a load or in towing. There are other forms used to test the recoil of guns and the explosive force of gunpowder. In the Batch elder dynamometer 10 Balance-dynamometer (plan). two pairs of bevel-wheels are interposed between the re ceiving and the transmitting pulleys, one pair in line with the pulleys, the other pair at right angles to them and in line with a balanced scale-beam. The force and resistance transmitted through the gears tend to turn the scale-beam about the line of the pulley-shafts, and this must be resisted by a weight upon the scale-beam, which is the measure of the force transmitted. The dynamometer is not a direct indicator of power exerted or of work performed; but when the velocity with which resistance is overcome or force transmitted has been determined by other means, this velocity, and the measure of the force obtained by the dynamometer, are the data for computing the power or work. See balance - dynamometer, crusher-gage, piezometer, and pre ure- gage. - Dynamometer coupling, a device inserted in a shaft by means of which the power transmitted may be measured. dynamometric, dynamometrical (din a-mōmet'rik, -ri-kal), a. [