. The Bell System technical journal . he sametype of microphone. The diaphragm is made from duralumin. .0017 inch in thickness and is clamped securely at its outer edge. The clamping surfaces are corrugated and emery cloth gaskets are provided to prevent slipping. The stretching of the diaphragm is done in two steps. The initial stretching ring is first advanced by means of six equally spaced screws until the diaphragm is smooth and free from irregularities. The inner or final stretching ring is then adjusted to a position which gives the 1^ Beginnings of Telephony, F. L. Rhodes, p. 79, 1929.«
. The Bell System technical journal . he sametype of microphone. The diaphragm is made from duralumin. .0017 inch in thickness and is clamped securely at its outer edge. The clamping surfaces are corrugated and emery cloth gaskets are provided to prevent slipping. The stretching of the diaphragm is done in two steps. The initial stretching ring is first advanced by means of six equally spaced screws until the diaphragm is smooth and free from irregularities. The inner or final stretching ring is then adjusted to a position which gives the 1^ Beginnings of Telephony, F. L. Rhodes, p. 79, 1929.«U. S. Patent Xo. 406,567, 1889. > Public .Address Svstems, 1. W. (.rtn-n and |. I. .Maxtield, .1. /. E. E. Journal,.\pril 192.^ pp. .U7-358. CONDENSER AND CARBON MICROPHONES 57 diaphragm a resonant frequency of 5700 cycles per second. Themethod employed in making the determination of the resonantfrequency is substantially the same as that used in connection with theassembly of the condenser microphone, with the exception that the.
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1
