phototube current meter

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phototube current meter [′fōd·ō‚tüb ′kə·rənt ‚mēd·ər]

(engineering)

A device for measuring the speed of water currents in which a perforated disk, which rotates with the current by means of a propeller, is placed in the path of a beam of light that is then reflected from a mirror onto a phototube.

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