UNCLASSIFIED RESTRicrED CONFIDENTIAL SECRET NOER WILL CIRCLE l'!ASSIFICATION TOP AND ._,,Ti)@i) CENTRAL INTELLIGEHCE AGENCY OFFICIAL ROUTIN SLIP - Al qVI7 2 TO INIT(ALS D A T E Assistant Deputy (Inspection anrl '@;pc-itrity) 2 3 4 5 FROM 2 DATE 1 ItpiLty-A agement.-- 2 3 =APPROVAL INFORMATION SIGNATURE =ACTION DIRECT REPLY RETURN COMMENT PREPARAT I OH OF REPLY DISPATCH 2 =CONCURRENCE RECOMMENDATION FILE RKS: This is a text of a letter received from U=C Would you please th s ba@c '4'*w'@'it@h@a;@7nwdication as to whether or not there appears to be an Agency application, 5 either domestically or overseas. SECRET CONFIDENTIAL RESTRICTED UNCLASSIFIED FORM NO. 3 04 SEP 1947 We have some electronic equipment which ve believe may be of interest to you. It is made up of four separate units. The first unit is a tape recorder of extremely high fidelity capable of reproducing in intimate detail all the inflections, nuances, and tones encountered in hirman speech. The recording can then be played back through the second unit, a specially designed oscilloscopic device which 2flashes on a screen in the most exact detail a moving picture of these inflections and tonal qualities. The third unit may be employed to halve the speed of the recording and, in turn, to double the resultant sound frequency thub providing a geometrically perfect picture of a spoken 'word with this picture moving at a rate slow enough to.permit careful visual examination. fourth unit permits the transfer of2 these oscilloscopic curves to a pe nent paper record for static visual analysis and comparison. This equipment group can be used in making almost micrometric analyses of the speech characteristics peculiar to a particular locale. Direct com- parisons can be made of the speech habits of individuals known to come fr= a particular place with those of another person allegedly from the same place but who may be suspect. 0 This same equipment may be used for polishing away speech habits which might result in the detection of an operative. We would appreciate an opportunity to discuss this matter with you in greater detail at your convenience. IA