REF ID:A522201 ... -.- -~ . -: .,.~::"---~·-·-----... -------- -·---· ·-··--·· ···- -·- .. "\ 

' , 

3rd Memo. Ind. 

ii .P. & 'i'.Div., OCSigO, Nove_mber 25, 1930 - To :Research & Development Dh1e1on, 

l. As suggested in the 2nd Mei:io. Ind., there 1e attached hereto a 

statement ot req.Uremente in the torm of a general perfol'DUUlco specification 

applicable to the cipher machine under consideration. 

2. l.lr • .Friedmwl of this Division will bo avt.ilablo at ~ time to 

discuss fllI'ther details that may ar_ise 1n oo.nnection with this project. 

t.ttschedSpecif ice.tion. 

I~. :B. il.Iora.n, 

C~ptnin. Signal Corps. 

JA'pproved for Release by NSA on 11-21-2013 pursuant to E.O. 1352§ 
.. .. .. , " 

I 

REF ID:A52220·~ 

WAR DEPARTMENT 

SIGNAL CORPS LABORATORIES OP'l'ICE OP THE OFFICER IN CHARGE 

FORT MONMOUTH 

IN REPLY R,EFER TO 

Mr. William Friedman. 

Office of the Chief Signs.i Officer, 

war Depa.rtmen t, 

Washington, D.C. 

141' dear Friedma.nz 

OCEANPORT, NEW JERSEY 

November 26 t 1930 

There is attached a general specification and operating 

requirements of the cipher ma.chine. It may very •11 be that yoa. may 

want to add to tbis or el1mi1'18te certain parts; do as you wish in this 

respect. · 

It is recaimnended, ho•ver, the matter be turned over to 

the R. & D. Division at the first opportw:d ty inasmuch as the f'ands seem 

to be available. It is believed tbat there -is Sll:tficient information attached herewith to enable Ersfeld . to ma.kB an intelligent bid. Upon his 

starting work, there are ma.D1' 11 ttle points which I 1'IOUld like to talk to 

him about without cansumi:ng the time necessary to mald.ng drawi:og layouts, 

etc. Yau. will note that the o-verall dimensions given are somewhat in ex• 

cess of that of the staDdam portable typewriter. This is due to the necessity of embodyi:ng a tape tra.nami tter which in itself has an overall 

dimension of Sf" x ~" x 4", am weighs approxt.matel7 6 pounds. 

Very truly 70U-rs, 

1 incl. 

GAG:F 
REF ID:A522201 

-.... r-----:.·- --·--·-·····-. ---- ----·--···----- ··--· - ... -- -- ···~-·....----·.... - .. -------·-. -···· ····-··--·~. 

SPEC D'ICA!IOX FOR PIELD CIPHER JIACllDE 

1. l!hS,e spec1t1cat1on usc:rS.bee a ponable -cipher machine to be used bJ' 

\he Anq f~r ene"lph~ring and deciphering meaaBB8s in the field or at pe~manent 

loca1i1one. It is desired. 1hat the over-1.l .cli•nslona be 111\hin 6" x 10" x 12" 

an.4 _that 1ihe approxilate •eish' not exceed 22 lbs. It is intended tha\ ihe 

~lpher machine be aaecl •ifih"' nl' batter7-~ !he ltatte!'J' •1Jl be of the BB-29 

norage tne and la not to 'be furnished as •pan of tbe machine. 

2. It is to be &H"&VIS4. that •ssagea enciphered •1th this machine will 

b_e deciphered subseqv.erit-~ with a similar ~hine using \he sue setting of 

.een.aln operational feature a. Tb.e machine ahall consle1i of' a proper frame; a 

three-row kqboard cons·Ututed of on.q :&he. 26 letters of the alphabet and 111 thout 11.D,J other k97a and ·associated bar.a such as 'the apace bar; etc. a a 'bank of 

26 maal). lamps, poeitioud prope:rl7 on an 1·neU.n.ed plus "1t·h the 2& let~ers of 

the alphabet designating each l&mp1 a rotatable. cipher wheel t;he orientation ot 

which is c!etermilled by the com11Luity of certain electrical c.ire.uJ.ts set gp b7 

the iliteraction ot a tape tranamitter in setting :u;p certain ·sequences in conJunction With ~ive switches operated pel"llU'tatiTelJ' as a set 117 pina.on the 

peripher7 of the ci~e.r wheel, a motor or ~ther means beiug. pr<:>v1cle4 tor preserving teuion on the apl'ing which rotatee the cipher 11.b.eel. Pnper magaeta 

shall be prov1d.e4 for releasing the cipher wheel and tor stepping forward ·the 

tape in the tape transmit.t·er. A relaJ shall 'be provide4 •hich tunctlona to 

impulse the circu1'\· at proper time and release same. "Thia assambl7· shall 

tanction so 'lhat in ·enciph~ring· -a message the pla1n-tm mhar.Uer •111 be 

struck manaall7 on the kqboard. !'Ilia particular. te7 1111·1 clo.se a co111iac'l 

and a c1rcuS:t will be closed. depending upon. t;~ poaitlon at that 1uta.ut of 

'the cipher wheel and the set of contacts established. at tbe tape transmitter. 

A particular lamp shall be illuminated., tbereb7 desipatiDg ·the c17J>'ograph1c 

letter res11lting fl-om that combination.. Upon deciphering, the reciprocal 

action. &ball ensu.e, 1.e., upon depressing the c17pt;ographic character keJ' on 

the lte7boarcl, and giftll that the cipher wheal aa.4 tape transmitter ~e in the 

same setting~ as tbe7 ·were at the. time of e.nclpherment. ot tbat cha'rac,er, the 

proper plain-text character will re.aul t • 

. ............. ___ : __ ; 
_ BEE:__ID: A5222.01 --- ·--··-···-- --.._- -· .. - --- - .. __ . -: . 

..-..... 

~. 

-2-

s.. !'~ ke7board &ha~_l be prov1d.e4 w-1'11 a etanaard. ·three-row arr.aage-

•nt of ke79 uiag onl7 the 26 letters of the alpbab.et. Each ke7 ·bar shall . . 

be prodded •1th an iml1vldua1 insulated conlac' whi-ch is proper.17 positioned 

oTer a fixed cont.&cR mou'te.4 1n'•gral to and "lnaula\ed from tbe •chine frame. . . 

!he ke3-bar con.tacts ·shall be •ired in comnon \o ·one s1 de of the· ba"t\eq. !.he 

tlxecl or statioDSJ'7 contac'a =shall b·e w1re4 to aa11_ sgring pluprs which . 

·make con1tac1i •ith flu.sh studs on the cipher wheei to be described ·iater.· 11; 

.!Jll therefore be seen 'ftbat all 26 -contact-a are coJaODef to ba\teey on one · 

s14e •. the other 26 contacts golng to the 26 plangera which· act 011 the cipher 

wheel.. 

4. t?he cipher wheel shall b• •cS.e· ot batelite or suitable insu.lating 

material of 07l1D4rical tor.m aAd carr1e4 gpon pref•rabl.J' a vertical shaft. . . 

Thia aban shall at all tlae.s be F.OT14ed with spring tension ~ending to 

ro'tate 'the cipher wheel. about the shaft. A amall motor· fllq be used ~ preserve this t-.sion on the ap:r1ag. Aax1Uar7· ll!l&thod• ot preserving this tens1on will be considered. ·!he cipher wbael shall be pr·o-Y1ded -on its per1phe17 

with. 26 teeth -eqaal.17 apace.cl. lfhese teeth shall woztc illto a lock pawl •h1ch 

ahall d~ermlne the position at which tb8 c1phe·r whe•l shall stop. Proper17 

in Une •1th these tee'bh·, .BrJd preterabl.¥ above, there. ahal.l be tiff pins set 

1nto the pe:r:lphef7 .of 'the wheel in llne aboye each 'tooth. !his is to b-e 

comt.rued ~ lSO pins in all couiating of ~ rows approxhlatel.7 us.85° apart 

with 5 pins per row. !he action of these pins W.111 be descr.1 bed later. The 

cipher wheel will baTe two heads or faces. .Each of 'these faces, top and 

bot"t;.om, llball be proYided Y.f.th ~ •tall1c oont·act stud.a tor .each of 1ibe 8'oP 

posit1olia de'termined 'b7 'the teeth abou\ the perl:phe17. ~heee studs ahall 

make contact with the aame ruu&er ot pl1111gers mounted 11ltegral wl"th 1ihe machine 

.and positioned abow and below the cipher wheel. the -atw.18 of ti. cipher 

wheel shall be conne~te4 from one face to the opposite face 'b7 •ans of flex• 

be sach that a reciprocal l'&la1i1onsb1p is preeened. ktween connectio~s to 

various letiiere. 

. -- - ~. -- ........... _ .· .... - .. 
.::.. 

REF ID :A52220.1 

- . .,"";, , 

--.;_. 

- ·S .. 

5~ '!he lamp bent aball coissJ.n ot 26 lamp socketa .arid lamps mounted o.n 

BA. 1n8\llated _panel at- a conTeDient qle tor ob.aer•a,1on 1oo the hor.lson.tal 

plane ot the mach'1Jle. '!heae lamps shall b·e anoanged 1n ~ rows ucl be 4eaignate4 b7 \he 26 letters of lhe · alpllabe-C. A preferred method ot. dea$.gna't1on 

ia to have ·each ltap aet. behiDd. a _groun.4 glass 41ac 0upon which the le,tei' is 

painted •ith a suitab.le black paint, so that when the lamp is illuminated the 

letter shows clearq upon the gro.and glaea surfac;e. 

6. I. tape tl'ansmitter ot a t7P8 COJllDO.nl.7 used 111 print!Jlg telegraph . . 

practice shall be turniahed to the contrac-tor. !rhis tape. 1i.ranam1tter is 

desi~d. tor use with a tape of the five-unit Bawlot code.. The holes· in the 

tape determine which ot a .set ot 5 oontaci;a shall be made at &ff3 instant. 

!'hese contaote shall be wired to Interact wUh the contacts ·Which are operated 

117 t• pins on tbe periphe17 of the cJ.pher •heel. fhe wiring 1n this respect 

:la shown ln Figm"e ·1. A \ape-stepping magnet is proYidell f'or· stepping forward. 

fihe ta,p• one• tor every operation of the k81'boar.4. It- wi.ll be necesaar7 to 

rewind this aagnet· f'or+wlt, operat.ion and to wire tbe 111S£J1et so· 1;hat it operates by tmlversal bar act"!on gpon releasing an.r ·DJ' of the ke)"board. ~his 

•7 be done as a rel~ fU.act.lon. 

·7. !he cir.cu.it •irtng shall be as aholrn μi attached figure J... AlterJmte 

method.$ performtag the .same tmotion •111. be. co.aa14ere.4. .n Will be note4 

tha'\ operation ot a given ke7 imch a "W" •111 set, ·ap a cirea.it from batterJ" 11 

throush the kq ·contacts., through the cipher wheel. lower arid upper contacte, 

"1lrough lamp deaipated "Q", ancl return to llatteey. !!?he lL\lllp •ill 'be illuminated and the lett.er "Q" desigaat·ed thereb7 for· ~~e operation ot the -.,n ke7 

with the cipher wheel in that parti.cular position.. The action or depressing 

'\he "Q" te7 shall ·llave a reciprocal relat1onsbip end the lamp desigrla'ted "W" 

shall be 1llm1na"te4. It is cle.s1red that this r~lat-ionahi"P be pre·aerved tor 

the 26 let$era ot the alphabe"t as operated by the· keyboard for ever, one ot 

the 26 positiou in which the cipher wheel 187 ba set. !his is simply a matt.er. 

of pro:jler •"iring· throDgllou.\. ·!he circuit arrangement.s for stopping the cipher 
REF ID:A522201 

•Jaeel at eiq PT• posl1ii• are •1- ldMntD.. Dependaa' upm the coatSlmitJ 

t.t&nnrgb the -nr.taua ooat-aot• lHr&wen wlre ·so ad w.tre Sl detendlles •he pealtlone of .a"toppap of tile e1)ller· 1'heel 1»7 •- ot the armtare or pawl of 

~u ••l etan1»c aap• u. the one •r1•• ot· OOlltaota designaad .26 ao\ 

la aocor4ance with tbt ;particular permaatlon ot the halea· ill 'the tape in the 

\ape t.ran..itter at a gi"9D. lna"81R.. ft.a other ll8t: ot ccmtac\1 4ea:lgm."'te·d. 22 

·"°':r 1.a. accordallee •1'h '&be pan1cala:r peraa.tatloa ot pJ.aa on the pertphe17 ot 

·the elpher ·•heal that p'l"eaenta itaalf at. a partical.ar maam1' to ti. C01Ltact 

lenra o.perate4 b7 them. !he plaa on. ·tbs o1pbar •lMMl mut 1n41'ri4ual17 be 

capable or l>ei.QfJ· either bl'eugh:t 1n'o operatJw poeit1on or lett in a neutral 

poaitioa. thu allowing of 26 41tteren\ grovpiaga or permte.'t.ions or operatiw 

a114 nn.tral pin·e aro•4 the pslphe17 ot the '1Jber wheel. \'he purpose of 

hav.111g the pins c1pable of being set· 1n'\o aa operat1Te or IWl'tral PoSltioa 18 

so that yarS.ows pe·rmata'tiona oea be eet up ant cbanced. at· •111. It 1e 4eaire4 

t'bat the •heel lte releasa4 m4 atoppe.d ~t upon the Jo!m action of the 

set of -.ap .... van8111tter. .eo.ntacte 8114 'b aet ot contacts cont.rolled 117 the piaa 

on the cipher wheel, acc0l"di.17g to the rW.e Ulat so lDD&' aa 'Ghe. penmta°'10A ot 

oamae\a est ap a"ti t.lJe tape 1ir&IWl1tter la 41rteren't fZOlll tlla'\ set up a\ 22 ·'b7 ~1*' 

~: ... 

pine on the oipher wheel.,. "he latter continua atepp!ag.,. and ato11a onq wherl tJsose 

two eete· ot cont-act.a coiDCJ.48. A ape.oatepptDg, ·21. ap.et i• ah01J1111 apera'\ecl bJ 

re.la'J' 28. A relaJ lball -.. provided such as tbat shown ·at 28., •hlch performs 

· whate•er .requJre•nts are necesaaJ7 s·uo)l as tape-nepplng an4 control for cipher 

wbeel. !he ut1on ot \hio. reia, ~ be ·•cle to 14\eraet meehanicall.J' wit.h a 

UiTVAl bar on tbe !cqlu>ar4. 

.s. l'u.rther ie"tail11 ot the •ehlae aa deacri.'bel ·alton _,.be •rkecl ·out 

:ln agreemm batweeD the con.tractor an4 a npreaezrteU:we of" the Sip.al Corps. 

'!he 1aspectSon •111 cona.iet la unlDg the wb•ne tor nooeaafV.1 opera1'1on ill 

enciphering ant -4eol»h&ring aeeaapa with a o1pller 1iape, a m1nimm apee~ of 

opara'H.oa ot 60 character• per· almlt• be!q re1u:tre4 tor eitber (BICJ.phemen\ 

or dealplLeren..t.. Proper clp!aer ~apea 11111 k fqna1Bbe4 ~e contractor. It •111 
REF ID:A522201 

-·'~Ao 

- 5 -

• 

be .aec••llU'I' 1A \bll 4nelopm&At- that oartaln ez;perimeatal work 'be done. !he 

b1~48r ahou.14 ·take 'Uleae tenvea. 111\0 ·00118ld8rat1on. &a a f1D1ahecl prodD,et. ia· 

. . 

daslre4. It 1• b.ellew4 '\hat autficieat det&ile ha.Ye bee gl•en '° proT1d8 the 

baai-a of aa ~e111geat bid. !lll''ther details will be provlcled. aa 'he work o.t 

asaem\1¥ progresses. 

• 
,r--~ 

I .. 

I 

! - -

-- .!> 

------RE-F~D+A5-2-2-2-Q-l----·-------

SPIC IPICJ.!IOI JOR P.J!ll.D CIPSEB VACBDE 

1. _'!hi• IP8C1ficat1on leacrlbe.a. a_~,able Glpber machllle to be_ u•4 b7 

•be. ,f.l!IV' for encipherS.iig and deciphering 11811869• 1n 'he field· or at permnent 

locations. It 1'9 4eeired·'til&t ~e o:t"erall diat~slona be within 6~ z 10" ·x 12" ~- .. : 

&114 that the apprmmate · •elght no1i exceed 22 lbs. . ·It · 1s Sldeuu4 1ih&1i the 

cipher mac~im N GMd •ith4 Yolt ._ batter7"' ~h• ltatte17 will be o'£ the .BB-29 

norage 'n• aad 1• not to be tarn1abe4 as a pan:· o~ the machine. 

2. . 1't le to· 'be &Hu.4 'hat ••ease• eimipherecl with this mach!B will 

be Miphered s\lb"sequ.ea.lq with a aiitilar Jiaehlne uil'lg the same aetti»g or 

aenaln OP'1'•1i1onal. teatv.ea. fb.e .chine· ·shall con1181i 01' a proper t'rame_, a 

three-row kqboar4 constituted or on:q the. ·26· lett.er-e Qf the alphabet and without arq other k~s and assoc1a1ie4 bars such aa -the apace 'bar;· etc.; a bant of 

26 -.11 l&llit•·· poe-1Uoaa4 prope:rl7 on an 1ml1.ne4 ·Plane with the 26 le1iters of 

the alphabet ua1pating each l~; a rotatable cipher •heel the orienta\ion. of 

•hlch is utermimd b)' the continuit7 of certe.J.n electrical ·a.1rcuJ:toa aet up b7 

'he interaction ot a tape traumd.,ter 1n ae\ting up certain aaquenoee in conJuno:t1on With :t1ve aw11'ches o_pera.'l;ed penarht1ve11' ae a set b7 pins on the 

periphe17 of the cipher wheel, ·a motor· or other means 'be111g prov1de4 .for preserving \enslon 0.11 the spring which rotates the . c-lpb.er wheel. Proper •£R•t11 

shall lite proY1c1e4 for rel,~aa1Dg 'the cipber wheel 11114 tor a'epp1ng ·forward the 

\ape. in the t11pe iruamit te,. A rela.7 ab.all 'be proY14&4 Which t1U1Ctiona 'to 

impulse th• ch'cait at proper time and release same. flab aaaembl7 ehall 

fanction so t·ha1; · in enciphering .a message· the platn.-ten ehar.aeter •111 lie 

at~ct Mna.all.7 on the ·kezboar4. "Ihle ·part·iclllar te7 will close a coli"tiac'i 

· and a circuit will. be closed 4epen41Dg -~-the -poaf,tion at tllat 1.Dn1a.t or 

, · the cipher wheel and the eet ot contact• es,abl1shed· a1i ·u• tape tru•1tter·. 

! 

·A particular aap 8hall ~ :illumin&ted,_.tharebJ' 4e11ptirlg tbe c17ptograpaic 

le-t.ter. rea'1lt1Dg from ·that comb1Dat1011. Upon cleo:lpher1ng,. the reo1procal 

ac'tlOJ.L ehall ensue. 1.e •• '\POD depressing the cr,rptograph1c character k•7 on 

the ka~board.. and gl Yen that ·tho cipher •heel ·and tape ir·analtit ter are Ut the 

aame setting, as tbq were_ at the t,ime of enclpherment of tbat character, the 

proper pla111-ten oharaot;er will resalt_. 
/ 

/ <i/ 

REF ID":A522201 

-2-

--. .-..... 

. \.. ."'/~ 

'--' 

•at 0£ te7a uing onl7 the 26 letters of the alphabet. Eaoh k&7 bar shall 

lte provid.84 •1th an 1mtiv14aal_ ln8'11a\ed ooatac\ which 1a prope·r17 poa11iioae4 

oyer a fixed oo.ttta°' moWlted int~l. io and Juaula\ed -from •he machine fram. 

!fhe k87-bar oomac"'s allal.l lte wired 1n comon \o one a14e or the ba'f;\eq. !he 

f'iz:e4 or 1ta:tioner7 contacts -shall "be 111red to emall, apr1ng .plungers which 

.make con"t;ac1i •it.b. tl!Hh atuu on -the oiph&r •heel t·o be deacr1be4 later. It . . •111 therefore be seen tltat all 26 contiacta are cO"tSOM{ to ba.1;ter"J" on one 

s14e 9 the other 26 contacts goilrg 'o the 26 plmagera which act on the cipher 

whael. 

4. !'he ciper wbsel shall be •de ot bake11te o:r aui.table 1nsulA1iiDg 

material of c711D4r1cal form and carr1e4 upon p:rete:rabl.7 a venlcal shaft.. 

'fh1a abaft a!lall at all t1mea be prov14e4 wStll spr1Dg teaaion 'eJMUl>c to 

rotate the c!pber •heel. aboilt the shaft. A. small motor flJB3" lre t.11ed. to preserve this tenaion ·OB the apring. Awdli&l'J' me'\hod8 of preaerYJ.ns thia tension will 'be considered. 'fhe cipher wheel aball be provided on lte per1phei'J' 

~ · •1th 26 -teeth equall7 spaced. '!base 'lieeth ehall •Olk tmo a look p•l which 

ahal.1 determille ihe poa1"\S.on at wh1oh the cipher wheel .aball step. ProperlJ' 

in line w1 th iihese tee•h,. ancl iwetei-abl¥ above. there •ball be .ti ft pins • 

111'0 the per1l)hel7 of the Wheel 1n. llne alHrr·e each tooth. fhia 1e 'o be 

couU'lled. as 180 pins i:n all coaaiat1.ag of 26 rows approzSmatelJ' l:S.85° apart. 

w1 th 5 p1Ds per row. !h• action_ of' these plaa will be 48.eerlbed later. Yhe 

c1·pbe:r .,heal will have two heads or tacea. Each of these races, top and. 

bo"ttom, ah.all l>e proY1.ded w1 th 26 anal.lie oomact studs tor each or the atop 

positions d.eterai.llecl b7 the teeth about tbe periphel'J'. fheae sta.de shall 

make con-tact with the aame camber of plugera •wited integral •1th the machine · . I 

auci :positioned aboTe md below the cipher wheel. !he· ·"au of the cipher 

•heel aball be connected. h'om one tace to the eppo·site face 'b7 •ans ot fiex1b.le conciuctora pasaing through 'the :1.at;erlor of the wheel. 'fbia wiring shall 

'be eucb. t bat a reciprocal relat1onah:lp ia preaerwd between connec1i1ona to 

T&rions letters. 
,. . 

~ 

_,........_· ··--- REF ID·: A5222Q-l· --·· ----·-·-----------

....... -

6.. ~he lallJ 'baat 8'1al.1 conaist of 26 lamp ao~na and lampa munted on 

aa inaulated peel at a conveaS.ea' angle for obaet'Yatioa to the horlscmtal 

plane Of the mchl,.e. fheae lamps nall be Rraage4 1n S rowe and be designated b7 \he 26 lettera of the alplabet. A preferred •:$hod ot des1pati1on. 

is to hat.Ye each lamp met· behind a groan4 slaes 41ac upon •hicb the letter· is 

pa1nted. w1-.h a auita'ble blact paillt 111 so thai USA the lalf1 1a ill11m1naied. the 

letter ·-· clear·l1' upon the sround glaaa aurf'aee. 

6. J. 'fiaRe vanllllititer of a t.ne comnon17 uee4 1n printing telegraph 

practice ahal.1 be fur.Qlahed to tbe contractor. !hie tape tranam1t.ter 1& 

clesign.ed tor uee •1'h a 11ape ot the the-unit Jalldot ·COd.e-. !he holes 1ll the 

tape determine n1cb of a set of Ii aoataota shall be aade at &IQ" inetrmt. 

!lleee aontac-ta shall 'be wired to inte~ •1111 the·coatacts 'Which are operaud 

bJ' 'he piAs on 'lbe perJ.»he17 ot •be olpher wheel. ·iae wiring in this reapec"t 

la shown ln lipre 1. A tve-etepplllg magnet ts provided tor stepping forwar4 

the tape once for &'181'7 operation of ti. k97boar4. It •ill be nocesaar.r to 

rewincl this -snet for +•lt operat.ton ancl to •ire '*he lUgllet so 'that l'l operates b7 UD1Yereal ltar action apon releasing 81f3 ke7 ot the t97board.. lfb1a 

~ _,. 1ut clone ae a relq fuactio.a.. 

7. '!he eireuit w!r1ng ehall be as ·ahollll 1.a. attache4 llsur• 1. Alt~nate 

me"\hod.a pertOJ'lllas the HlllEI f'UllCticm will be considered. I'\ will 'be note4 

t?lat opera·uon -ot a glY.en .tq mah a "W" •lll aet ·up a o.il'Oult troa batter7 11 

'throgp the kQ' cont.aot•. t-lilovgb the cipher Wlleel, lewer and upper oomac·t•, 

'\hroagll lamp 4e11pate4 "Q" • an4 return to bat'teJ7. the lamp •111 'be 1,llaminaie4 an4 the letter "Q" cles1pate4 t.bsre'bJ'" for· tb.le opera"tion of the .._" ke7 

wlth tbs cipher wheel la that parUcalflZ' pos1t1cm. !'ha anion ·of d8preae1.ng . . 

ihe "Q,• Jte, Uall baw a rec.lprooal nlationabip and the lamp deslgnate4 Of!" 

shall be lllamll!ated. Iii is desired that this relat1onuip be preeeryed for 

the 26 let"te:ra ot the alphabet as operated b7 the k87board tor ewa17 one· or 

the 26 positiou ill Which the ~pher wbeel _,.be set~ lfhie 1s simpl.1' a mattR 

ot projer wiring ~.brovgboa.t.. fte oJ.rca.it U'l"~B tor doJ>p1ng the a1pher 
r------·. ·-- .. --·-··· --·--· .. -·· .......... REF I_D : ~.2 2 2 0.l.. ~ -

wheel a\ ..,,. ss..-m -posit~ are ai. *-• De~ QllDJl tbe ooat111111i7 

tlu'o-llgb tJMt YAl'ioU oontao'te l>e*-m wire IO aild Wlre S 4etRldnaa the pos1t1oaa of atonase of the cipher ·:wh.eel 1'7 •en• ot the aratue ur Jll.Wl of 

t.be Vb.8el nepp1ng -ene\ a. !!he one 1SG'l'lea of aoataots d&aignated 26 ut. 

la accoruaoe wS.ih the part1eul.at permlat!on of the hole• 1n the tape ta the 

tape tranalttar at a gift.a !astant. !Im other an ef contaets clealptecl 22 

act~: 1a aaoordallce wl'th tbe put.tcular pe!'121dat1on. ot plaa on the peripberJ' ot 

t.he c1Jller Wheel tbsiJ pnaeata l'taelt at a part1o'Glar ml!n.Bl°' w ti. oOlltacJ't 

lema operate-cl bJ" tbem. fte p!ae on the oSJ>bar •heel mut !Qdid4u.ll7 be 

capable o~ being either bJ>oasht· iato operat!Ye poa1t1DD o:r ·ieft in a neu.trAl 

. poaltlon. thu allawlns ot 16 cUtt•elli f:P"Ouplnga or permtations of operat1w 

an4 neatfttl p1na around tbe P.•1Ph•Z'1 or9 the otpbsr wbeel. '!be pVJOse of 

bav!Jtg the pine ospable · of ·beiJIB. ast; 1n\O an o,.n.t1Te or uatral poa1t-1on ia 

•that nrlou permtn1ons oea be"' up ud oUD8e4 at w111. lt le cleaired 

1ibat t1lfl Wllael 'be nleaaet. ·•d atop,pe.4 4epandellt· upon the Joint action .of the 

.. ot -tap.e-trumaitter oadana er.t4 'the aet ot COA'acta COSLtrolled b7 the p!na 

on the cipher wla.eel • ..:oo:rcliJc to ftlle rule tlla'$ so ·1oag as ,. ;e:naatioa of 

omlact• .- up e.t ~tape trai.wd.1i'ler 1• different froa 'Ut.at aet qp a~ 22 )J ,~. . ~ 

\". 

pSm oa the cSpher 1tbae1. ~ latter aont-1.mes etepp:Sag., md atop. Ol'll7 wheD 'boae· 

'"° sete of oQDtAO'l-s Oo1no1de. A •pe-atepptagti: 27, J111!1t8D8'S 1• llhown. o)'er.ate4 b7 

n.l.&7 •·· A relq ~1 be proTicle4 a&Ch as tJaat aboWA a't 28, wh1cJa :pertOl'll8 

shate•r recau.trelDIUlts .ue MPBllU7 ash &a "\lipe-etepp1ng an4 control tor cipher 

wheel.. !he action ot tb1a relq ~ be •c!e to ~enc\ aecban1oalq wi'h a 

·aiTer-1&1 bar on the k87'boar4. 

e. rvther detail• ot the nachiae ae dsscrillect abon U7 be worked oat 

!n apaemnat betweGD tbt co».ttractor M.4 a repreaen,atJ.1'8 or tbo -Signal Corps. 

'!he Sllapect-.lon will aonaS.at la ~ating the· llaOhiDe· tor aa.ooe.aaftll ope-rat ion 1rt 

. . 

enci·pher!ng aria.. 4ecipher11g •a·aapa· with a a1P.Mr ape~ a. minimlm apee6 fff 

-operation ot 60 cbal'Mtezr• per r.dmlte beJq requir•4 tor ei the.:r enclphement 

·or deoipheneat. Proper Ciplael" tapea will lie tm'Dlllhe-4 .,.. contna\Or. Jt •111 

. 1 
\,) ' ~ 1. } 

------·- ·-· RE-F- -- -I:D--~-AS-2--2·2-Q-1-l--- - ------

- ·~<: ,,. '-:' 

,[I 

-sbe aee11&J'7 la tb8 4~1-paed tba• oer1'a\D experimental work 'be 4one·. ne 

bl44er abol&ld ~ale• "1\eea .fea'\•e• SAto ·CoiMd.deJ"atlon aa a tln:1slle4 pro6:&.n is 

duirad.. I• la 'bel1eft4 1ihAt aui'f1c1en'\ details ·i.ve 'beu g1'ftn to pro11.l.e the 

'bat1:a or aa lctelllfSe.nt 'bid. Jurthar de•a1la •ill be pnv.ided ·u the work ot 

ana"bl.1' progreeaea.