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Longitudinal Wave Demonstrator

Longitudinal Wave Demonstrator used to demonstrate the image of the "movement" of the dense and loose parts of the longitudinal wave. A narrow width of the trapezoidal barrel arranged in a black 260*85*12 black board, barrel front has a narrow vertical groove; the barrel axis is provided with a rotation disc, with a painting of a series of eccentric disc sizes of circular plastic paper, this piece of dish called crova disc, part graph of the disk can be part of the bucket positive vertical groove connecting the central axis of the stem is revealed