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0ffice of Publication amplifier apparatus applications April Armour Research Toundation Audio Engineering Bell Laboratories bias Bibliography Brush Development CAMRAS characteristics contact printing cording curves dcre described diagrams are included discussion distortion Electrical Engineering Electronics erasing field film frequency response frequency strain analyser high fidelity high frequency strain Illustrated description John Crerar Library July June keying head Laboratories magnetic material magnetic recording systems magnetic sound recording magnetic tape recorder Magnetic wire recorder Magnetophon manufacture medium Model 20 Motion Picture Engineers noise Photographs Picture Engineers Journal portable Poulsen Publication Board Report recording and reproducing recording device recording equipment recording head recording of sound recording on magnetic recording process recording wire Reichsrundfunk reproducing head Sept signal Society of Motion spool steel tape steel wire supersonic tape speed techniques telegraphone telephone Telephonograph tensioning mechanism tion transient recorder wire or tape wire sound recorder Wireless World