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Photoelectric Tachometer for Precise Centrifuge Speed Determination¹

ABSTRACT

Certain chemical and physical investigations such as the mechanical analysis of soils by centrifugation require that the speed of rotation of the centrifuge be precisely determined. For a cost of approximately $40.00, when used with instrumentation normally available in research laboratories, the system outlined provides a vivid, unambiguous indication of the speed of rotation, the accuracy of which is limited only by the frequency standard used.

¹ Contribution from the Northwest Branch, Soil and Water Conservation Research Division, ARS, USDA; Idaho Agri. Exp. Sta. cooperating.

² Mathematician and Soil Scientist, respectively, Snake River Conservation Research Center, Kimberly, Idaho 83341.

Received for publication May 4, 1970. Accepted for publication July 10, 1970.