1967 Volume 36 Issue 3 Pages 209-210
When an ultrasonic beam is incident on a platelike tank, consisting of two sheets of plane parallel plate glass with a thin liquid layer of acetic acid or carbon-disulfide between them, a kind of ultrasonic standing wave is formed in the liquid, if the angle of incidence is within a certain, region. The pattern of the waves can be observed by a comparatively simple method.