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Abstract
Two acoustic prisms have been built, made of an obstacle array of brass strips, the strip-width corresponding to half the wavelength of sound at frequencies 10 and 3 kc./s. respectively. The deviation of sound waves by these prisms for various frequencies has been experimentally studied in a closed chamber with absorbing walls lined with felt wedges. The latter prism, of bigger strips, has been constructed with a view to increase the resolution of frequencies which are very close together. The experimental results agree very well with the theory. Suitable spacing of the strips is also attempted to reduce the loss of intensity of sound during transmission.