TACHOMETER
\takˈɒmɪtə], \takˈɒmɪtə], \t_a_k_ˈɒ_m_ɪ_t_ə]\
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An instrument for showing at any moment the speed of a revolving shaft, consisting of a delicate revolving conical pendulum which is driven by the shaft, and the action of which by change of speed moves a pointer which indicates the speed on a graduated dial.
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An instrument for measuring the velocity of the blood; a haematachometer.
By Oddity Software
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An instrument for showing at any moment the speed of a revolving shaft, consisting of a delicate revolving conical pendulum which is driven by the shaft, and the action of which by change of speed moves a pointer which indicates the speed on a graduated dial.
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An instrument for measuring the velocity of the blood; a haematachometer.
By Noah Webster.
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An instrument for measuring velocity; especially, (a) a contrivance for the purpose of indicating small variations in the velocity of machines, one form of which consists of a cup and a tube opening into its centre, both being partly filled with mercury or a colored fluid, and attached to a spindle. This apparatus is whirled round by the machine, and the centrifugal force produced by this whirling causes the mercury to recede from the centre and rise upon the sides of the cup. The mercury in the tube descends at the same time, and the degree of this descent is measured by a scale attached to the tube. On the velocity of the machine being lessened the mercury rises in the centre, causing a proportionate rise in the tube; (b) an instrument for measuring the velocity of running water in rivers, etc., as by means of its action on a flat surface connected with a lever above the surface carrying a movable counterpoise, or by its action on the vanes of a wheel, whose revolutions are registered by a train of wheelwork.
By Daniel Lyons
Word of the day
tinctura quininae ammoniata
- A preparation made by dissolving quinin sulphate in alcohol [Br. Ph.].