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  • Author or Editor: B. Vonnegut x
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H. H. Jonsson
B. Vonnegut


Experiments are described on the behavior of a wind vane that is constructed in such a way that it is forced to oscillate about the wind direction. The forcing is accomplished by allowing the upwind edge of the vane's fin to jibe back and forth between two detents. The frequency of the oscillation is found to be directly proportional to the wind speed. For a given wind speed, the frequency varies with the square root of the fin area and the inverse square root of the anemometer's moment of inertia. The response time of the device is proportional to the inverse of the frequency.

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J. J. Jones
C. Grotbeck
, and
B. Vonnegut


A simple instrument that detects ice particles has been developed for use in airplane studies of thunderstorms. Although sophisticated instruments are available for imaging atmospheric ice particles, the spatial resolution of the particle concentration determined from their data is limited by the small size of the sample area. The ice detector described here provides a real-time indication of the presence of ice crystals within and in the vicinity of clouds, and provides an approximate measure of their concentrations with excellent spatial resolution. This device, which is simple and inexpensive, has been flown for five summers in New Mexico thunderstorms.

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