Abstract
A standard of low frequency sound-pressure was developed following the general theory of previous investigators. The dynamic pistonphone consists of a chamber about 50 cc in volume and a piston 0.3 cm in diameter driven by a moving coil mechanism, capable of executing strokes of approximately 1.0 cm at frequencies between 20 and 100 c.p.s. The stroke is measured by means of a telescope and scale, and the pressure developed is computed assuming isentropic law. A small crystal microphone is used as a pressure indicator within the pistonphone chamber, and becomes a calibrated microphone for the measurement of sound field pressures. The device appears to be more simple and easier to use than pistonphones previously described in the literature.
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