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REF ID:A72294 

lL4 Oct 49 

Department' ot State 

~!..2c~ ~~t·c~r~~ c:!:!:t1!:ti~i~. s~~dt, l:wohiko.rt,-Dictap-apll .Pro?lQ.ots L•., "81h:.JJ.::oirton, D.o. 

ftapical Securit7 'Fquipment 

ru P•l'BOl'llal. Attending: Mr. A ..... Small! Hr. Dll'Tid i"lolfand, !fr. RI ii. Scott, 

Lt. Joseph Besj an, Lt. Joseph L. Bart.on 

~·Ji~~ 

1. On 12 October 1949 qineere tram. AS-81 vJ.•it.i the State DepartrLent 

tor the,ptU?>11e ot mauaird.ng eeveral device• recently deaiened tor i:hJ'sioal 

••curit7 .... ~ •• 

2. The Research Products CompalJ.7 ot DanbU17 ~ Connecticut, 1n conjunction with th• Diotagrapb eorporation has developed a aable from which it ia e.xt.r~ 

ditf'icul.t to 'izit.ercept 1ntell.1gence. This cable to date has not been tapped IUOcesa~ either pbpicali,. or incluctivell' b7 the developers or the state 

!'Jepart.ment. The cable and aaeociated e.nd-equipr:umt. wre dETe1oped to .meet a 

requirement. of the State Department in their embasSJ' installations. 'l'he 

eonatruct:lon ot the cable includes 51 uncoded pairs over which is pl.aced two 

lq'ers ot metallic toil, one 1.,..- being a continuous eolici cover ar..d the other 

l.Qlar epiralq coiled around the cable with an axtr~ emall eepa1stion 

between the turns. These lqers of toll are separated r&1ii allJr' by 2 tine 

laJer ot JVlon. 

'· The end-equipment ie a device which containa a 11a1•r-tooth ol! cillator, 

an al.am,, micro-nitches, and station indicators. '!he eaw-toot.h oscillator 

prt)ducea a a!.gnal which is impreeaed across the two la,era of toil. The theory 

,,,.O'..~;:~.;ti~cal inchion is made to reach thu pairs aey 

tnatrwnent. which goes throueh the two lqara ol foll lfill create a eihort circuit 

which will irDD1diateq set off an alarm. This theoreticalJ-7 prevent.a a 

pb;yaica1 interception. To prevent !nl.ercaption inductively the eigual. which is 

applied across the lqera ot toll create• a etron.z magnetio tield 1'1d.ch is of a 

high level with reJ:arence to the le••l of the lntellicence on an.r o:i· the pairs, 

therebr preventing any 1nte1llgenco from beine picked up. Several J>O&aible _,., 

ot inte:rcept.ina; the cable both pbJ'aical.17 and inductivel.J' 'rfhich had not been 

• attempted b,r the dnelopeN were brought torward by the an,gtneeru fl-om AS-.811 

bowfl'er these ideas were theoretical and have not been tried. 

SEGR:T 
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--REK.-. .,1J?,i A72294 

'1LCJOCI 

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. Report. ot Contncta Out.aide of Se cur.I. t7 ~i visionJ 14 Oct 49, Continued 

4. Diacueaion with Ur. Schmidt ot the Research Producta Comp8J11' 

rnealed \hat he personall.7 ha• ptv-81cally tapped gae-filled cables similar 

to the gas-tilled cable• in use at the AriQ' Securit,' A.gency; and that he 

peraonal.17 has ir¥1uctive]Jr tapped other cables •imilar 1n their induct.J.va 

ehielding to auch gas-tilled cablea1 ao that he believes gas-tilled c11bles 

are insecure. Thia 1ntormation has been passed to l\s...83 tor •IV' actic•n 

deemed necessary. 

5,. " Prodnd.ty Alarm 97atem 11&s demonetrated. 'l'hia unit is a d••vice 

that will detect urt person or body that approaches within the field •>t a 

long wire or aareen antenna. It operates on' a balanced plate-supply 3ircuit 

tor an oscillator which feeds the antenna. 4 change in the antenna f teld 

causes more plate current to be drawn which will eet off an alarm in !I. guard 

1tation. It ia also to be provided with a microphone pl.aced in the protected 

area which enables a guard at a remte point to llX>nitor noises in the 

protected area. 

6. There -.s also d•monatrated a developnent ot an el•~ctric-t;n·e lock 

which •& deyeloped to replace the three-combination loOkJ t.he thr·ee--co.mbination 

lock requires raplacam.ent because of recently developed 1ru.pcrzania d•iVicea 

1ddch have pe:mt. tted the openil'lf. of thia tTpe ot lock in ah:1rt order. This 

electric lock operates on a principle of inter1ocking relays which a1.. operated 

in a detin.ite sequence. The rel&J"B are ope:rated bJ' puah buttons wtdoh appear 

on the taoe of dmce being locked. There. are tan operating buttons of which 

eh constitute the proper combination and tour are b1ank ri th retere.1ce to the 

combtnation. It an;y ot the four "bl.anks are pushed at a1>7 time the alarm will 

be eet ott beeauee they are wired directly to the alarm eyste'!l. It Sf11' of the 

eh: control buttons are pUahed out at aequence the alarm will sound. The 

eequenc• of six buttons out of ten 11J11.7 be chan3ed at 8fI3 time. In the event · - that someone 8hould start. working the prope:r combination ll'P to the 11.xth digit 

and then tail to complete the co.ui>ination, the lock w.lll automatically reset 

itself aft.er a pertod of twenty Hconds, and the proper sequence of aix baa 

to be atart.ed again. Thia lock in the opinion or As-81 enf,ineers if an 

extremel7 tine dnice. 

q~,;;:~ 

JOSEPH L. BORTON 

lat Lt, Sig C