Abstract
After a consideration of the relations between the "pipe" and the "Helmholtz resonator," graphs of the variation of amplitude, obtained by means of a hot-wire anemometer traversed through various types of resonator, are reproduced. By means of a calibrated manometer of the vibrating membrane type, some direct values of the impedance of orifices are obtained. With the hot wire, traverses across an orifice through which the air is vibrating in simple harmonic form are obtained, which show a tendency for the air to vibrate with greater amplitude in annuli remote from the centre of the orifice.
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