For showing the wavelength of vibrations in air in a closed tube, by depositing lycopodium powder at the nodes. Comprising a glass tube approximately 80cm in length and 32mm in diameter at one end is a tightly fitting but adjustable cork piston fitted to a metal rod 100cm long and at the other end, a loose fitting piston attached to a rod, 100cm in length and 8mm diameter. Overall length fully closed 1.89m approx.
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