A Differential Anemometer for Measuring the Turning Tendency of Insects in Stationary Flight

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Science  30 Sep 1966:
Vol. 153, Issue 3744, pp. 1634-1636
DOI: 10.1126/science.153.3744.1634


A pair of thermistors forming part of a direct current bridge circuit was mounted in the wake of a moth in stationary flight. Differential changes in the thermistors' resistance provided a sensitive index of changes in the direction of the airstream as the insect made attempts to turn away from a source of ultrasonic pulses.