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Which among the following is an oldest mechanical timer?

(a) Stop watch

(b) Egg-timers

(c) Balance wheel

(d) Hour glass

The question was posed to me in examination.

My question is taken from Movement of Piston in Dash Pot in division Viscous Flow & Turbulent Flow of Fluid Mechanics

1 Answer

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Best answer
The correct option is (d) Hour glass

Explanation: Hour glass is a device that is used to measure the passage of time. An hour glass contains two glass bulbs connected by a narrow neck. This allows a trickle of material from the upper bulb to the lower one. (Material most commonly used: sand).

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