Abstract
HAS Lord Rayleigh tried the effect of holding a piece of sheet iron or of compressed charcoal in the small pointed flame of an ordinary foot blowpipe when the air supply is somewhat in excess of the needs of the flame? By adjusting the gas supply, the air pressure, and the position of the iron sheet, sounds can be obtained varying from f to s or sh. The oxyhydrogen flame, supplied with a slight excess of oxygen, is even better. The air entering a vacuum desiccator through a narrow stopcock gives a fairly good s sound.
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