r 

OCSigO 070 

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SUBJ'EOT1 

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REF ID:A105039 

WAR DEPARTMENT 

OP'FICE OF THE CHIEF SIGNAL OFFICER 

WASHINGTON 

Invention 

Director, Signal Corps Laboratories, 

Fort Monmouth, N. J. 

llay 27' 1936 

l. Your comments are desired as to the feasibility and 

military value ot the invention of Captain H. G. Miller and 

Mr. w. F. Friedman, described herein. 

2. Upon the return of' this ooJDllllinication, 1 t may be ~orwarded to the Patent Section for action or comment. 

By Order of the Chie£ Signal 0££1oera 

Inals. 

2 pages of' description. 

Walter C. Ellis, 

Major, Sig~l Corps. 

10. 

@'pp roved for Release by NSA on 09-11-2013 pursuantto E .0. 1352a . ·--·-- ·- -----='==-=··--=--=-~-=:::::::=:::==============-----_..;i;i,IL 
. ----- "7-

FM(SCL) 070 

('J/27/36) 

/ c i ,. REF ID:A10503~. 

y 

lat Ind. FTG:B 

SIGNAL CORPS LABORATORIES, FORT MONMOUTH, OCEANPORT, N. J. June 5, 1936. Toa Chief' Signal 0££1.cer, War Department, Washington, D. c. 

1. The disclosure of Captain H. G. Miller and Mr. W. F. Friedman 

does not include sufficient details upon which a decision as regards 

f'easibility and military value may be based. This is particularly true 

in the absence of an;y experimental data. As a strictly theoretical 

consideration and assuming all elements are held in phase, it is conceivable that operation as described may result. · · 

2. In the final analysis the praoticability of the system depends 

upon the exactness of phase and or magnitude of frequency components, 

which are dependent upon the magnetic positioning and response or the 

impressing and oelcel.i.Dg magnets, the oharaoteriatios of the various 

eleotrioal circuits, and the respective rates of progression of the steel 

tapes. As shown, the progressive rate of the tape is also dependent upon 

a varying drum diameter asewning uniform shaft revolution. In other 

words the description is oonfined to the germ of the idea and on that 

be.sis none er the practical considerations is discussed. 

Incle. withdrawn 

L. L. CLAYTON 

Major., Signal Corps, Director 

> I 

'·. 

__ .,. _ _..,.____,_, _____ --: 

~ 
) . 

·----REF ID :Al-OS-039 ________ ,. ___ .T"":"""' 

I 

•J:MOIWU7JI JORI !ese!!l.""Cb ui:l »nolo;.oat 111 v1•1on 

(THnUt far Pl&D.1 a Tra1111ne DiT1ation) 

1. There ar• to1"Warded herewith 'ko eitetohes and brief 

aplanaticm o~ a "S.Yateiv And Moans tor inci;her1t1t 21.nd neciphe:r1n,it 

la&tt•tloal'l,y-lecorded Si(nala•. wh1ab 1Jt t.h~ ~oht itrf11nUon o.t tho 

Wlderaiped. 

i. bo doubt f-.3• ~.;.n ex,pntt1h1Jm! with .J'6#f;:rd t.o the validlt.J 

ot the ba.:s1o ••il~ons U,.lOn wl\ieh tho idG~a •bodied in the· •x•tu 

J&OW nat. It i• \lnder.st.ood th~t lllfr. tt .. D. Hwthbercer ot the St.inr.l 

Coi"ii>S L&bora:'torte11 4.t fort Ion.mouth he.11 aad& nt.her •M..tana1ve inTe.-t-

:lpUous in the t1vl4 in which tb1s ••tu tall& and 'that ho 11 

upectod to be. in t'tald.ni;ton. 1n t.h1; utar tut.ur•.. .A 4ontc-enc.o iz:1th 

h1a on thiff eubj•ot would be .oat de.d.mbl• anj it 11 r11qucated that 

thl• ba U"Te.n;•d tor,. 1t pract1aable"' 

3,. It t.h&. q•t.&a turn.a out- t.o be thcoreUcall1' &IOWld 1n p~lnciple, 

it 1• dA!tw•d that patent. appUeat1on be filed thereon. 

Harrod o. Wlar, 

Captain, Sigtll'5.l Cot",t)I • 
REF ID: A105039 .-w-

... 

lat Ind. 8 

0081&01 War Plana l 'l'r~ining D1V.tli1®, llq 2,, 1936 .. Toa Research 8: 

De'felopment D1v1t1on• OCS1&011 

Attached a 

Two aketchtur. 

I. s .. Ru11bough, Major, St1nal Corpa. 

·- ··-·- ·····-··-------------------------------------
-f; 

s: 

H 

Amplilier 

Spool 

Ste.e.I 

Modulator 

Tape.TRANSMITTER 

Aeceivin..9 1--+-9 

Arnpli£ier 

Ste.el 

Tape 

o' c' s' ..... 4·"* ...,,,, lmpye.ss1!' M~nets 

R.ECEIVER 

.__ ___ ....... 

S=Se.c,ye-\ La"jua<je. 

P= Plcian Lon.9uel9e. 

output 

Amplilie.r-1---......... -

F' e.e d Ba c le 

Output. 

SYSTEM AND MEANS FOR ENCIPHERING AND DECIPHERING 

MAGNETICALLY-RECORDED SIGNALS. 

Trar.smitting end: llectricAl oscillations corresponding to input aisnala are recorded 11111gneticall7 on a moving metal.tape, the tape passing s\1CcesFivel7 between the paired impressing magnet• ABCD which are in 

series. Thua, the final or resultant l:lllgnetimation of the tape correaponds to a Eequence of blocka of 

algebra1call7 superimposed freq~enciea repreaentable by the aequence .A., AB, ABO, .A.BOD, BODE, ODEJ', •••• the 11 .A.11 block coming at the head of the train, 1Jhen the record i• passed between the paired reading megneta at 

2, aignals correa~onding to the reaultant magnetization are emitted or tr~nsmitted. These are enciphered 

sb:nel1 • ..,.,..,. 

Re~eiving end: The impres•in& J:lB&Jl•ts, 3, record the received aignals Aagneticall7 on a metal tape moviric 

et 11pry?"OximPtely the same rate of speed as at the transmitting end. The record pa1ses between the paired 

m11r.neta at 11. The m21gnet .A.1 h a reading magnet end 1ta output is led to the amplifier, where part of the 

energy is translated into final output, and part ia fed back into the impressing magnets B', 0', and D'. 

The.electrical circuits are such as to cause the feed-back alternations impre1sed on B', c• and D' to be 

of onnosite pha~e from the alternations fed by .A.' into the amplifier. This re1ult1 in neutralizing and 

removin,; the homolo~us m21gnetic equivalents on the tape, leaTing only the original plain lll!lgW!Ce on the 

~ane when it reach•• l:il!Gnet A1 • The signals at thi1 point are deciphered 1ignal1. The c~tographic prin- ciole consist• in micrometricall.7 var7in,; the diatancea between magzi.eta A, B, O, and D an~-making homologous micrometric adju1tments of the distancea between mer.n~t1 .A. 1 • B1 , C1 and D1 , the irariation1 beinc 

determined by prePrranged cipher kq1. ·~- _ _ J _ 1 I') fi 

u~ /rJJ~l.(.,t!wio -t'i-i· f),.sc..fo~u.-c.. ..c.c.~ol-c... "''1 '""'~""'""'"~ <)., .. nn • • . di ,, ·w ·J .l.LJ...-... . .:;}:J.,. :.c.a._,_._ 

#',,,",~,,'?;Ju =:o~~-r ~~/;Ar~ ~IN ~:t 0 ..,,,,.,,,--,,.-, , 7°'1 7 '- . 'lllt.IMJ 17, '"'l ~,/.''. .~ ~t:J. .. ~-~ 

~,.#1,,,".,,' a ~~ E-_.._.- #. ·.~'#c~b ~ 
Receivin,g 

Amp. 

lmpress;".9 

M~riets 

3 

REF ID:A105039 

INPUT1--~~~~~~~~......., 

AMP. 

1 

___ I_m__._re--.ssi~ Mo_gnets 

D C B A 

Impress1n9 

Ma~ne+s 

c· 

4 

Readin3 

Ma,nets 

2 

Input 

~~~~~~----1 Output 

Mod. 

Schematic ReP.resentation 

of OpeYation ~I ''s~stemQnd 

Meat1S for- e11c1phe ... in_g and 

Decipherin,g Ma9netica\~ 

Re.corrJed Si9nals ;• l11ve11ted 

M~ 12,193(> b~: . 

1.tY~~~~ 

/~_g~ ~c;;p./7 .~. 

A mp. Output 
' mpress1n.g 

Ma_911ets 

3 

REF ID:A105'039 

Impressing 

Ma9r1ets 

D C B A 

o C B 

r f .. f ~ & 

Input 

Amp. 

_____ I Output Mod. 

+. R resentation Schema.::. of.'s_ystem .,.nd 

of Ope£0;1 encipherin.9 and 

Means o . a ne.ticol\y 

Decipher1ns,9· M rs'.' lnvewted 

Re.cotded 19na ' 

M ~ 12,193~ b!f: . 

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r/ I~~ 

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