with the diaphragm, but when sounds are uttered in the tube attached to the cell, the diameter, could be driven at a speed of five knots per Ul Apia diaphragm is vibrated, its motion being made manifest hour in calm weather and against a fresh breeze at four knots. The engine producing this effect… … of a variation of speed. The blades of the propeller cell consists of two chambered recessed disks fastened Fig. 3—PHONOGRAPHIC RECORDER. should be of steel accurately shaped and arranged to be together with screws, and clamping between them a turned at greater or less angles according to the…
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![An illustration from [Graphophone patents] (1878)](https://img.insideoutlibrary.com/img/200/ia-graphophonepaten07unit-751-489.webp)
