Dynamometer definitions and example sentences on Wordnik

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Definitions (6)

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noun Any of several instruments used to measure mechanical power.

Century Dictionary (3)

An apparatus for measuring the amount of force expended by men, animals, or motors in moving a load, operating machines, towing vessels, etc.; a power-measurer. Dynamometers use the resistance of springs, weights, and friction as a test, each comparison being made with a known weight or force that will overcome the resistance of the spring, 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 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 compressed 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 Batchelder dynamometer two pairs of bevel-wheels are interposed between the receiving 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 pressure-gage.
Dynamometer coupling a device inserted in a shaft by means of which the power transmitted may be measured.
An instrument for determining the magnifying power of a telescope by measuring the diameter of the little image of the object-glass which is formed just outside of the eyepiece: usually, and better, called dynameter, to distinguish it from the instrument for measuring stress.

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This FOA is for the design and construction of a large dynamometer facility (a dynamometer is a device used to test a motor or engine for efficiency and torque) for testing 5 to 15 — Renewable Energy News - RenewableEnergyWorld.com
Peak forces were measured on a Kin-Com dynamometer, and electromyographic (EMG) activity was also recorded from the biceps brachii. — CiteULike: Everyone's library
How to find the horse power of an engine from an indicator diagram by a pony brake or a dynamometer. — Recently Uploaded Slideshows
Nissan's official estimates; enthusiast magazines have tested the GT-R on a dynamometer, which measures horsepower, and come up with figures far higher. — The Car Connection
Manufacturers usually test yarn and fabrics by means of an instrument called a dynamometer. — Textiles For Commercial, Industrial, and Domestic Arts Schools; Also Adapted to Those Engaged in Wholesale and Retail Dry Goods, Wool, Cotton, and Dressmaker's Trades

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dynamometer

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