REF ID:A522295 

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Jlz. Officer 

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REF ID:A522295 

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I ROUTING and WO~ SREE!_ 

('Io be used under provieione o! Par. 41.6 b, OtfJ_~_e_R~.k~1a.tions, OCS1g0, l9Z4) 

F1 om: Research & Development To: Viar Plans & Training 

Your comments and recommendations are requested. 

W. C. E., 

7/1/35 

W. P. & T. 7/2/35 To: SIS 

Comments and recommendations -!'etluested. 

Cansler 
---------.... ---=----- ~~~~-----------------~ ------REF 

.£" 

/7 

OCSigO 41.3.55 (M-134) 2d Ind. FTG:K 

(6-25-35) 

SIGNAL CORPS LABORATORIES, FORT MONMOUTH, OCEANPORT, N. J., June 28, 1935. 

To: Chief' Signal Officer, War Department, Wa~hington, D. C. 

1. The inclosure which should have accompanied basic communication 

is a photostatic sketch; two copies of this sketch are appended. 

2. Reference paragraph 2 of 1st indorsement, the instructions 

previously furnished are being observed. 

1 Incl.· in dup. 

Photo. sketch. 

WM. R. BLAIR 

Lt. Col., Signal ·Corps, 

Director 

OCSigO 41).44(M-134(6-25-35) 3~ I~. 10 

War Department, OCSigO, Washington,_ July 10, 1935. To: Director, S.C.L., 

Fort Monmouth, N. J. 

1. The cryptograL"lhic security afforded by the present model of 

Converter M-134 is believed to be satisfactory and no changes other 

than those previously agreed upon are authorized. 

By Order of the Acting Chief Signal Officer: 

Incl. w/d. 

Roger B. Colton, 

Major, Signal Corps. 

- -·-==-·,~--- ------- --........ ~~-------
_,. 

·--------- ---REF -ro-:-AS-2 2 2 95 

.; ,. 

SUBJECT: 

TO: 

WAR DEPARTMENr 

SIGNAL CORPS LABORATORIES 

FORT MONMOUTH, NJ 

Converter M-134-T2 

Fl'G:K 

June 25, 1935 

Chief Signal Officer, War Department, Washington, D. C. 

l. Duri~ the recent visit of Mr. W. t. Friedman of your office to 

these Laboratories, the hypothetical question was raised as to whether or 

not the tape could be eliminated from such a machine as the Converter 

M-134-T2 without sacrifice to the cryptographic security. It seems that 

the distributionaf' these tapes may not at all times be convenient. A 

possible means of accomplishing such a result is described herein. It is 

suggested that the Cipher Section, your office, study this matter and 

advise these Laboratories as to whether or not a further investigation is 

desired. 

2. There are attached two photostat copies of a possible alternative 

construction to give the effect of an endless tape in lieu of the tape transmitter in the Converter M-134-T2. This method was developed jointly -by 

Mr. w. F. Friedman and Mr. G. A. Graham of these Laboratories. While the 

proposed method has not been proved physically or cryptographically, it is 

believed the theory mS¥ offer sufficient promise to warrant investigation. 

3. The anticipated advantages of tbemethod are a very material 

simplification of the existent Converter M-1.34-T2, higher operational speed 

possibilities, and the elimination of the necessity for a distribution of 

tapes to pertinent stations as well as incidental t~pe operation troubles. 

It is believed that the same cryptographic security is offered as in the 

use of a very long tape. 

4. The attached sketch is reduced to the basic electrical and mechanical 

features involved and does not show such features as keyboard, printer, 

cam contact lock (either mechanical or electrical), or wheel-step-forward 

release relay. However, the basic consideration is that each cipher wheel 

steps forward an idler cam wheel, the contacts of which control any other 

cipher wheel. The cams are arranged haphazardly and the cam wheels are 
.-

--==-------- - . -- REF ID:A522295 

,; 

~ 

Le. to CSigO, 6-25-35 - Converter M-134-T2 

interchangeable. Also, the circuits between cam contacts and cipherwheel stepping magnets are interconnective manually, or subsequently they 

may be arranged to automatically switch, in"V&rious manners, after a given 

number of characters have been printed. 

L. L. CLAYTON 

Capt., Signal Corps, 

Director. 

10 

War Departme~t, .OCSigO, Vlashington, June 26, 1935. To 6 Director, Signal 

Corps Laboratories, Fort Monmouth, N.J.· 

1. Returned. Neither photostats nor sketch ref erred to above were~_;receiYed with basic communication. 

2. - lour attention is invited to previous instructions to the 

effect that it is desired that two service test models of this device be 

built, service tested, standardized and ready for procurement by the end 

of the F .Y. "1936. - -

By Order of the Chief Signal Officer: 

Roger B. Colton, 

Major, Signal Corps. 

(2d Ind. mn following sheet) 

~-----=:---...----.. ~ -- -----==-·.:-=:--~""""""'-=--- -~~--~. ·=·-·:.=.m.....,..,.-- - --~....,..-------