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Sketch 



LIST OF FIGURES (cont,) 



43 Chronometer Time Control & Phone Monitor (Time Tone Amplifier) 



44 Power Supply 



45 W„Eo 124A Amplifier Modification 



46 Automatic Switching & Signaling Unit 



47 P»La Sound Level Recorder 



48 2„5 Min c Mirrophone 



49 Caltron Magnetic Tape Recorder 



50 SOFAR Station Assembly Block Diagram 



LIST OF SKETCHES 



1 First Step in Self-Noiae Measurement 



2 Second Step in Self -Noise Measurement 



3 Third Step in Self -Noise Measurement 



4 Fourth Step in Self-Noise Measurement 



5 Input and Output Noise Voltages of 120B Amplifier 



6 Schematic - P«L<, Graphic Level Recorder 



