• REF ID:A699~8-· 

Dr. Jan Ba.johman 

RCA, 11.Lboratorlea--

Radio Corporation ot America 

Princeton, now Jersey 

Dear Dr. Rajchm&n.1 

Maroh 11. 1943 

• 

,Thank you very much tor your lettor or llaroh· e. I 

tmderstapd that the nan in charge of the other project" 

which we are going to visit has made arl1Ulgementa for· 

OUl" transportation from Princeton Junction Station so tho.t 

there will be no need_ to trouble you about that. Ue 

expeot to arrive arouad. noon on Friday and shall get in 

touch With you by phone a• soon as we reach the laboratories; 

_·Anticipating a very pl~asant visit, I ~ 

-•, 

Sincerely yours, 

\iilliam F. Friedman 

Director ~r Ccmmunioations 

Research 

!Declassified and appro~ed for release by NSA on 04-02-2014 ·pursuant to E.O. 1352§ 
' 

A RADIO CORPORATION OF AMERICA SUBSIDIARY 

Mr. William F. Friedman 

Director of Communications Research 

War Department 

Office ot the Chief Signal Of'ficer 

Washington, D. c. 

Dear Mr. Friedman: 

RCA Labore.tories 

Radio Corporation ot America 

Princeton. New Jersey 

March 8, 1943 

Thank you for your letter 0£ March 5. 1943, infonning us 

that it will be convenient for you to visit us on Fri~ay, 

March 12th. 

We have requested written clearance from NDRC tor yourself, 

and Majors Leo Rosen and Frank B. Rowlett. Dr. Stibitz is 

mailing it today so that there shall be no difficulty with 

the fonna.lities. 

Jlay I suggest that you give us a call when you arrive at 

the Princeton Junction station so that we can have one of 

our men pick you up as it is difficult to obtain taxi service 

from there without advance notice. 

IDoking forward to the pleasure of seeing you, 

Sincerely, 

JR:C'B 
e 

•• REF ID:A69978~~ 

.·. 

Ur. George a. Stibitl 

Bell telephoner La.boratoriea 

llew Yori::• llew York 

Dear Ltr.Stibitu· 

JJarch 2, 194ij 

. i wiah to th.a.rile you very mu~h .tor yen.μ- letter Qf 

February 26. in connection;with Dr. BajchtQ8.n •. I shall 

look.forward to hearing troi:i him within a·aay or two. 

•. 

_Sincere~ yours, 

~ m.lliB.Ill F. Friedman 

Direotor of Ccmmunioationa 

Research 
e 

e REF ID:A69978 

OFFICE FOR EMERGENCY MANAGEMENT •• 

NATIONAL DEFENSE RESEARCH COMMITTEE 

OFmE 

JAMES B. CONANT, Chairman 

RIQIARD C. TOIMAN, Vice Chairman 

ROGER ADAMS 

OFFICE OF SCIENTIFIC RF.sEARCH AND DEVELOPMENT 

1530 P STREET NW. 

CONWAY P. COE 

KARL T. COMPTON WASHINGTON, D. C. 

FRANK B. JEWETT 

CAPT. LYBRAND P. SMl1H 

MAJ, CF.N, CLARENCE C. WILLIAMS 

IRVIN STEWART, Eucutive .s..:m..,. Bell TeLephone Laboratories 

463 "Nest Street 

New York, N. Y. 

February 26, 1943 

Mr. William F. Fried.man 

War Department Office of the Chief Signal. Officer 

Washington, D. c. 

Dear r.~. Friedman: 

Mr. A. B. Clark is out of town, and 

his secretary turned over to me your letter of 

February 22 about·Rajchman. 

I do not understand why your letter 

did not reach Dr. Rajchman. I called him and 

asked him to write you, however. He says ~hat 

R.C.A. Laboratories, Princeton, N. J., is the 

complete address, and he should have gotten your letter. 

::::::J~ 0<1s 

Chier Tech~i~~~~ide Section D-2 

GRS: lVJ.V 

copy to ~!r. A. B. Clark 
• 

Dr. Jan Rajclu:Jl.n 

RCA labo::-e.tories 

REF ID:A69978 

, • 1,' • " • I ~ \ 

?Jareb s. 1943 

!ladio Corporation of Anerica 

?rinceton, i:en Jers"y 

Dec. r ~r. Rajchr.an: 

neceipt of your lotter of Fe~ru.a.riJ 27., is aoknowlodcod. 

On r.farch 12, I o.n to be o.t the RCA l.a'!:>oro.tories on another 

ratter but e:::pcct to ha.vo the opportunity t'o visi~ your 

lAbora.tories to learn of the o.ovelo:;mants '1hich r.iight be or 

intorast. I t·:ill be acco.."'J?8ZliCd by trro of r:u a.saociates., 

?.:ajors Loo Rosen and Frank B. Rcr.vlett. and i:f' it ·is not a.skin~ too mi.Jch I -;rould li'ro for ·thon to bo \7i th ne at tho ti.mo 

of &..."1'9" denonstro.tion you me:.t be !)repa.1,"'0d to {;ivc. 

I. do not k:no'<1 whethor rq reGtJ.lo.r' r:ar De,a.rt:r.ient be.dee 

·:,;ill bo suf.!'ioient by l7D.jt of idontiticntion so fa.r as your 

section is concerned because it aorta.inly doeEl not carry with 

it any- extorr..al ovidonce of citizenship. I think probably 

the sane is true in l

4

ecar<l to tho puses '7hich qy o.esociates 

will car?"J• i."iill tho badge c.nd the ordL"lAzy pa.saes be sufficient avidenco of citizonship? In oonneation With the 

othor p1~ojoot \'lhich ! flr.l to soe et the lo.boratories I might 

any that arran~nents ha.~e been r.nde therefor through Dr. 

t:.":urra.y. 

VerJ truly yours. 

~Jilliam F. Fried..or:Bn 

Director ot Com&lunicntions 

rtescnroh 

~ ~. • • :1.., I'"":'\ r _, :"""', nl";-7'· 1) ·, } 

-.. - l' 1•1:s I • I I I ·'. i' •. : . ' .• 5 I ',I I·.· : J ·'~ \... .... _·.j\1_, \,~\.::~ J,·- ... .,. 
A RADIO CORPORATION OF AMERICA SUBSIDIARY 

Dr. w. F. Friedman 

RCA Laboratories 

Radio Corporation of America 

Princeton. New Jersey 

February 27 • 1943 

r- _,J --~ 1' II • I 

. d~ ·~ 3 ;:. .jj}i-,...: · .. ~~ [ ... , !i .,:_ ~.i..l o LI .::i.:J l:'>'- ; 

Director of Communications Research 

Office of the Chief of the Signal Corps 

War Department 

Washington, D. c. 

Dear Dr. Friedman: 

Dr. George R. Stibitz. Chief Technical Aide of Section 

D-2 of the NDRC.mentioned to you recently some of the 

work we have done under an NDRC contract and thought that 

it may be of' interest to your Cryptanalytic Bureau. He 

just called to inform us that you have written to us and 

are awaiting an answer. Your letter must have gone astray 

since we have not received it. 

We believe that our work might possibly help you and would 

be very glad to show it to you. We hope to hear from you 

soon so that we may arrange a definite date f'or a visit to 

our Laboratories. 

Very truly yours, 

Jan2~<y~~ JR:O'B 

P.S. In order to be permitted into the Laboratories you 

must bring with you proof of' u. S. Citizenship (birth 

.certificate. affidavit of oirth. or Company identification 

card showing proof of' citizenship).