Show speech scrambling device de vice shown 1 r X t 1 13 before an audience of prominent washington business men and govern ment officials sergius P grace of the bell telephone lione laboratories demonstrated the manner tn in which se secrecy becj in transatlantic telephony Is secured the device delce consists of a scrambling arrangement art an gement or speech inverter ln erter which reverses the high an aal low voice frequencies producing nn an unrecognizable jumble of squads sounds then by another device lie he proceeded to unscramble the words as Is 13 done at the receiving end left to rl right 9 ht maj 0 S albright of the army war college sergius serg us 11 grace ind and gen george IV gibbs chief signal of the alie army |