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dynamometer

Definitions

  • WordNet 3.6
    • n dynamometer measuring instrument designed to measure power
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Webster's Revised Unabridged Dictionary
    • n Dynamometer An apparatus for measuring force or power; especially, muscular effort of men or animals, or the power developed by a motor, or that required to operate machinery.☞ It usually embodies a spring to be compressed or weight to be sustained by the force applied, combined with an index, or automatic recorder, to show the work performed.
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Century Dictionary and Cyclopedia
    • n dynamometer 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.
    • n dynamometer 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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Chambers's Twentieth Century Dictionary
    • n Dynamometer din-am-om′e-tėr originally an instrument for measuring force, such as the pull exerted by a horse in drawing a cart: the name now usually given to instruments for measuring power
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Etymology

Webster's Revised Unabridged Dictionary
Cf. F. dynamomètre,. See Dynameter
Chambers's Twentieth Century Dictionary
Gr. dynamis, power, and metron, a measure.

Usage

In literature:

The incline of the track, added to the reading of the dynamometer, showed a total screw thrust of 2,164 lbs.
"A History of Aeronautics" by E. Charles Vivian
The ratio of increase in the volume of coal-power may serve as dynamometer.
"The Education of Henry Adams" by Henry Adams
The poor boarder in bombazine is my dynamometer.
"The Professor at the Breakfast Table" by Oliver Wendell Holmes (Sr.)
At the outer end of the derrick, the dynamometer and a fourteen-inch block were attached.
"The Home of the Blizzard" by Douglas Mawson
Regulators, Dynamometers, Pneumatic and Hydraulic machinery.
"Scientific American Supplement, No. 433, April 19, 1884" by Various
Sometimes the power of an engine is ascertained by a friction break dynamometer applied to the shaft.
"A Catechism of the Steam Engine" by John Bourne
The experimental hall contains a 7 horse power gas motor, dynamometers with automatic registering apparatus, counters, balances, etc.
"Scientific American Supplement, No. 787, January 31, 1891" by Various
Bennie forgot the dynamometer, forgot his message to Burke, was conscious only that he had wakened a sleeping volcano.
"The Man Who Rocked the Earth" by Arthur Train
Dynamometer, right 90, 90 (two tests); and left 100, 100 (two tests).
"The Attempted Assassination of ex-President Theodore Roosevelt" by Oliver Remey
Testing the breaking strength and the elasticity by the dynamometer.
"Textiles" by William H. Dooley
Machines in which brakes are employed for purposes of the second class are commonly known as dynamometers (q.v.).
"Encyclopaedia Britannica, 11th Edition, Volume 4, Slice 4" by Various
Carried upon the bridge is a platform which bears a number of instruments, chief among which is a self-recording dynamometer.
"The Romance of War Inventions" by Thomas W. Corbin
It is convenient to distinguish between absorption and transmission dynamometers.
"Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 9" by Various
The theatre-going public is a sort of dynamometer.
"Autobiographical Reminiscences with Family Letters and Notes on Music" by Charles Gounod
The Siemens Dynamometer was the first instrument of this type.
"The New Gresham Encyclopedia" by Various
This process will serve as a dynamometer to judge of the increase of power.
"New Method of Horsemanship" by F. Baucher
The dynamometer results show no gain in strength of grip six months after operation.
"Adenoids and Diseased Tonsils" by Margaret Cobb Rogers
At the last the levitation was such that the dynamometer rested horizontally on the table.
"Mysterious Psychic Forces" by Camille Flammarion
The strain shown on the dynamometer was high, but was not near the breaking point.
"The Atlantic Telegraph" by William Howard Russell
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In news:

Dynamometer testing clearly shows that the heat generated by the Vortex Unlimited during a braking event is significantly less than with a standard brake drum .
The size of the chamber allows Fras-le to fit a full axle of a pickup truck inside for testing, whereas only corner axle testing is possible with smaller dynamometers .
Installation of dynamometer next step in CESAR's progress.
To compliment its line of engine management systems, Bazzaz announces a full line of premium-quality motorcycle, kart, and ATV dynamometers.
The Bazzaz Principia dynamometer is created to unlock a new level of performance tuning with smarter electronics and a premium construction.
These advanced materials are developed in-house using the dynamometer test facilities at our friction technical centre in Chapel-en-le-Frith, UK and will be pr...
Q A friend of mine has after-hours access to a brand-new Dynojet dynamometer.
Tilting Engine Dynamometers Explained.
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In science:

Let us consider a test body of unit mass kept on a congruence of absolute rest by a dynamometer of negligible mass; also the other end of the dynamometer is assumed to follow a congruence of absolute rest.
The group aspect in the physical interpretation of general relativity theory
According to Whittaker and Rindler, the quantity α then equals the strength of the gravitational pull measured by the dynamometer .
The group aspect in the physical interpretation of general relativity theory
A testing device in turning including, in particular, a six-component dynamometer, is used to measure the complete torque of the cutting actions, in a case of self-excited vibrations. For the tests, the used tool was a noncoated carbide tool (TNMA 160412) without chip breaker.
A force torsor analysis for a turning process in the presence of self-excited vibrations
All the cutting actions (forces and torques at the tool tip point) are measured by a six-component dynamometer . The instantaneous spindle speed is continuously controlled (with an accuracy of 1%) by a rotary encoder directly coupled with the workpiece.
A force torsor analysis for a turning process in the presence of self-excited vibrations
This method provided a necessary mechanical stability of the contacts and allowed a free deformation of the crystals. A uniaxial pressure was created by a spring dynamometer and transmitted to samples via a punch with floating heads, thus securing a uniform pressure even at possibly non-parallel faces of the sample.
Influence of external factors on dielectric permittivity of Rochelle salt: humidity, annealing, stresses, electric field
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