Abstract
A rotating mirror is the basic element in the highest‐speed cameras of both the framing and sweeping image types. The factor of merit of these cameras is determined mainly by the peripheral speed of the mirror. The turbine drive described here will spin the best‐quality steel mirror up to its bursting speed. Flat mirrors with faces 17.5 mm wide by 21 mm perpendicular to the rotational axis are operated regularly at 10 000 rps. A camera designed to use these turbines and to take pictures at the rate of 3 500 000 fps, (frames per second) with an exposure time of 0.1 μsec, is illustrated.

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