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L/Ss of man playing a cinema organ. M/S of man blowing old fashioned horn. Several good diagrammatical drawings explaining how the sound is made through the horn. M/S of scientist type man demonstrating how sound changes with different air flow. He first tap a tuning fork onto table and place it just over a glass tube, it makes a low humming sound. Some water is then poured into tube and he does the same again. This time it makes a much louder sound. C/U of young woman blowing into glass tube, a whistling sound is made. Footage of cinema organ being made. Man lifts a bowl from oven full of molten metal and pours it into a device called into a bath. The metal is spread over bench in thin sheet. It is allowed to cool before two workmen roll it up into a sheet. M/Ss of man rolling sheet metal through a hand press. Several good shots of the pipes of the cinema organ being made. M/Ss of man attaching numerous wires to inside of organ. M/Ss of machine testing the durability of musical instruments including a dr
