. The Bell System technical journal . Fig. 5—Polar curves showing response (expressed relative to the axis response)of 115 cycle cut-off exponential horn with moving coil type receiver at various anglesfrom horn axis and 12 feet from the Fig. 6—Polar curve showing response (expressed relative to the axis response) of115 cycle cut-off exponential horn with moving coil type receiver at different anglesfrom axis and at a distance of 12 feet from center of horn mouth. interest. Two loud speakers having uniform sound power outputover a wide frequency range so that the dynamic characteristic
. The Bell System technical journal . Fig. 5—Polar curves showing response (expressed relative to the axis response)of 115 cycle cut-off exponential horn with moving coil type receiver at various anglesfrom horn axis and 12 feet from the Fig. 6—Polar curve showing response (expressed relative to the axis response) of115 cycle cut-off exponential horn with moving coil type receiver at different anglesfrom axis and at a distance of 12 feet from center of horn mouth. interest. Two loud speakers having uniform sound power outputover a wide frequency range so that the dynamic characteristics wouldnot obscure the acoustic effects were used. The loud speakers wereplaced at the edge of a skeleton platform 15 above theground and the condenser transmitter suspended at various positions 150 BELL SYSTEM TECHNICAL JOURNAL in the sound field. Care was taken to suspend the transmitter and itssmall associated amplifier between small poles in such a way that anypossible reflections from such objects in the sound field would not reachthe transmitter position. As for reflections from the ground, thedistance of the loud speaker from the ground with the consequent sounddivergence from the radiating surface, and also the a
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1
