USEFUL APPLICATION OF THE MICROPHONE.
A new application of the microphone to the determination of the position of nodes and ventral segments in columns of vibrating air has been communicated to the Academy of Sciences by M. Lena-Carpi. The microphone is mounted on an plastic membrane stretched over a little drum, and then lowered into the sounding pipes, j When tbe apparatus came to a I node, the telephone in circuit with the microphone* gave out a rumbling sound, similar to that caused by an induced current. On. the other hand, when the microphone passed a belly, the sounds became very faint and rare, while at intermediate points they increased or diminished, according as the microphone sounder was brought nearer to a node or a belly. It is believed teat the microphone may thus be made useful as a detector of fire damp in mines. According to some observers, such explosives are always preceded by undulations too feeble to be detected by the human ear, but these latter would be revealed by a series of microphones placed at intervals through the mine.
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South Canterbury Times, Issue 3023, 5 December 1882, Page 3
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182USEFUL APPLICATION OF THE MICROPHONE. South Canterbury Times, Issue 3023, 5 December 1882, Page 3
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