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An Inexpensive Device for Measuring Rotational Speed

Clifford P. Seitz and H. B. Shapiro
The American Journal of Psychology
Vol. 52, No. 2 (Apr., 1939), pp. 276-277
DOI: 10.2307/1416114
Stable URL: http://www.jstor.org/stable/1416114
Page Count: 2
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