◆ SpookStack

ee phones frequently being . - . gource of sound. If it is not 7 possible to place the dia oo . . phragm of the microphons in close proximity te the atea . _ } {that must be covered, an { . : acoustical impedance match ling device should be installed \ _ 7 '... wires mus be strung . Le, . from the microphone to the re ; amplifier to carry the minute . , ctrical impulses... + . { m FBI also lists in great . 7 oe etall the best places to hide ye ; ; microphones as follows; be ; : eo hind baseboards; behind pow- 7 Lo “7 , er outlets and electrical fiz- . ; ¥ |tures; ventilating and heating : an ‘ducts (to be effective must be . concealed so that flow of air - will not strike or affect micro “ ~ phone); behind radia‘ors, avoid intense heat; adjacent to service pipes; behind walls a ° | (place microphone as near sur . . face of wall inside room &s s® . ° -curity and time permits); in . . ; heavy. and s¢ldom-moved fur ~ ; niture; in dummy telephones; “e in ornamental and large basa . . ; : lamps; in Jarge and seldom ' ; used books; in calendar pads; ee in picture frames; in doors, a 5 - locks,--deor Ikmobs,.ete; in _ . radio, television and intercom munication sets. “Existing facilities such as telephones, public address sys- . ‘tems, intercommunication sta awe . te a itions, and speakers in radio ; . and television sets may also be ‘used to perform the micro a on ' 2 ot » ere Feats Peed gb On Al AER te FL 7 en os er EA me eae aH ‘ ’ ee we ne reir cari 8 phone function.” . * * . - - ’ Lae ee . ae —— - ee . fe aor a a ° - po Hs em rc . - ee ee ee ee . ars Fn ee eee aor Pea i