. The Earth beneath the sea : History . lOO Frequency ~ c/s 1000 Fig. 7. Response of SIO system from hydrophone output to oscillograph trace; dB relative to maximum response of each channel. Auxiliary information that must be noted includes all of the information listed for the shooting ship plus attenuator settings, depth at the receiving ship and a running record of instrument connections and settings. At the conclusion of each station, electrical calibrations are made on one more of the hydrophones by inserting a series of calibration signals (from 2 c/s to 20 kc/s) to the calibratio
. The Earth beneath the sea : History . lOO Frequency ~ c/s 1000 Fig. 7. Response of SIO system from hydrophone output to oscillograph trace; dB relative to maximum response of each channel. Auxiliary information that must be noted includes all of the information listed for the shooting ship plus attenuator settings, depth at the receiving ship and a running record of instrument connections and settings. At the conclusion of each station, electrical calibrations are made on one more of the hydrophones by inserting a series of calibration signals (from 2 c/s to 20 kc/s) to the calibration resistor in the pre-amplifier and taking a brief record. This gives the total response of the system excluding the hydrophone element; an example of the response of the system from hydrophone output to oscillograph trace is given in Fig. 7. In the system of recording developed at Lamont and Woods Hole, most of the differences in procedure stem from the practice of silencing the ship during
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Keywords: ., bookcentury1900, bookcollectionbiodivers, booksubjectoceanbottom
