thers appeared white against a black background. (See fig. 5.) The camera used to photograph the feathers was developed in the laboratories of the Eastman Kodak SWIRL METER A swirl meter was used to indicate the rate of rotation Company (reference 2). The film moves continuously of the air about… … i showing feathers inside the glass cylinder. speed motion-pic!nrc -One frame Crfl center of the cylinder head. (See fig. 2.) The vanes tion and at the same rate as the film during the exposure were driven by the rotating air and the number of turns time. The pictures taken for this investigation…
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