Ekman current meter

Ranked #100 on the list Best Measuring Instrument of All Time

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About Ekman current meter

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The Ekman current meter is a mechanical flowmeter invented by Vagn Walfrid Ekman a Swedish oceanographer, in 1903. It comprises a propeller with a mechanism to record the number of revolutions, a compass and a recorder with which to record the direction, and a vane that orients the instrument so the propellor faces the current. It is mounted on a free-swinging vertical axis suspended from a wire and has a weight attached below. The balanced propellor, with four to eight blades, rotates inside a protective ring. The position of a lever controls the propeller. In down position the propellor is stopped and the instrument is lowered, after which reaching the desired depth a weight called a messenger is dropped to move the lever into the middle position which allows the propeller to turn freely. When the measurement has been taken another weight is dropped to push the level to its highest position at which the propeller is again stopped. The propeller revolutions are counted via a simple mechanism that gears down the revolutions and counts them on an indicator dial. The direction is indicated by a device connected to the directional vane that drops a small metal ball about every 100

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