A differential anemometer for measuring the turning tendency of insects in stationary flight.
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.
D007313:Insecta / Q000502:physiology*; D009482:Neurophysiology