REF ID:A521740 

• 

1. Th.-. are being torwanled. her-1th d!"lil.f\ •peoitieationa 

and dl"ll1Pi.ng8 oC>Tering a pt'Opotted. modification of CoDTel"ter Type 

!il-134f2, with Uut requeat that pdent application be tiled. 

thereon 1n 'f41 mae tor uaigsma to the War .Depanaeut. 

2. The proposed. mod.iticaticn sbo-uld be considered in connection 'lrit.h .further dnalopumtal work to be don& on this 

a.chine by the Signal Corps !.sboratoriee at fort lk>mouth 

"aban funds become available therefor on July l, 1936. 

AttaiShed1 

Specitioat iom an:.t drawinga. 

eclassified and approved for release by NSA on 12-16-2013 pursuant to E.O. 

13526 

' .. , i ] " -:fM ~ d '"r·'·::i .,. ... , . 1 ' -;f\1.,tf ,t .. &'!_. /,;1,'t.,. · , •' . .. ' .... · -

:' I l~ 
.,..,,-~~~· ---.r-·.,··~· 

.. ,. . . ' ... 

REF ID:A521740 

Jn my prior application serial No. 632,096• I disclose a 017Ptographi0: 

eyatem .and m~haniam, the basic feature ot which le the provielon ot melln.$ 

for aper10dicaily controlling a set ot juxtaposed switching or olpher oomnutatoril giving oryptographioally a cascade effect. In that s~t- the means 

referred to involves the use of a oipber""key transmitter throtlgb ;whtch a pertotattd ke1•tape is paased. 

Th• objeat ot this invention is to control the juxtaposed cipher oormnu-

··; ' 

tatore by meane ot an assooiated set ot cam wheelo ot ditfer•nt diameters, 

"'· 

.... 

thus dispensing with the perforated tape referred to abo'll'&• 

'Iha in1en~ion ia described in connection· with th~•• draWtnga. · F!g. l is 

a sohaaat1o diagram or the mechanism, including a set ot five oam wheel• oon- .. . . 

trolling a o.oi'.responding number ot electr~gnet1ot stepp1n8: 'dedcoa tOr 

etteottng angular displacement of the col!lllutatoro. fig. 2 ahon pa1red c1rou1ta 

oorre1p~nding to a set of ten cam Wheals tor eloctrioally oo.ii,roll1ng the tive 

eleotro.maptlCt stepping deviaeD of J'ig. 1, together with switching means 

' :··. .':"'· ·: •• j• 

tor ~o~~g the eleotrioal oond1t1ons •et up by the caur''1b~ei.a. rs.g. 3 

" ' . ·.· ' .... 

,, ' ,J 

SlYH ·.an. det~~la of a oam wheel. 

'i ' .. ' ~: '. 

l 

;\. . . Rete"ing :,0 fig. 1, there are shown tbe following el~e::"'1ioh are 

' :~ ' • ,: •., ,,' • ' • ', •, •( I ' 

wel1-tft0rm ·in· the art applicable to modem cryptographs emplbtlng":t.tat.&l:tle 

. ; . ,j,: .. ·; ' . . • "!(1;:::·;·\:'~:'·.'?'.:::.·:<:i'.·: .. · . 

. o1ph•r ~~ton•.· • :'~' ' The numeral l generally 4eaignatea a st.~~ ' " ' I ' ~~\w • ' 

:-~"·~< .. ::..:V .. ·": 

ke~ provAA~. with a. set ot keys for oloaing a set ot ooii~~~~s •OM"eBpQncl-

··.,; 

.· .. 

'.:.·.· 

.. •, 

.··i' 

·:; 

i 

I , 

' I 

I . I 

I 

I 

; 

! 

j . . 

: 

i 
i.• .• 

·' ,! . 

'i . ... 

' '. 

. r :. .) 

REF ID:A521740 

1111 or .in41ca~1ng devices which may take the form ot a •d ot ...... _. ot a 

printing meehani911l1 or a. set or gln lamps to indicate by 1Uumlbatton of 

the ke1'>oardt ~. pnerally deaignatea a aet. of jwdapoaed, rotatable oirou1t 

' . . '. ·, ' 

ohupnl oonat.ruat8d in the form of switching comutators OotUoDlY called 

' ' . . ~-'.! ', . ' 

tlpkel' ooimmtatore, mountable upon a common shatt and arrang84 to rot.at• 

mmber of variabl$ paths tor the paeeage of an electric cur:r•t. ·xeepreeeiding : ,•" 

a menage oharaot.er set up on the keyboard, the exaot. path travere&4 in each 

inetanoe being detemined by the relative rotatory positions ot the Whole set 

ot oipar · oonamalatore and end plates at that 1natant 1 . 4 generally daaipatea 

a "' ot .-•win& meohani-., tor etteoting a.ngul&r displaeemea~a::ot th• cipher 

of •as, lndiaated generally at s, tor controlling these at;pping meohaniBU ', ·, · .. 

through tu inte"'941a.oy ot a aet of pawlll and ratchets, au .. t.m ••'1• aeao- : · ..... 

cia\e4 rith tla• ratchets, the cams opening and closing circuUa tor operating 

th• el~ro-magnet1oally controlled stepping meehaniame. . -; 

:<\. :: ·' ' ~ 

·.th~ U.t · ~ol'tant element• et the cipher 0GmS1Ut&tor o~l-01 aea .. ly, $., 

. 1) 

"··1; : . 

. . 

I 

" l 

1 

f 

i 

l 

i 

i 

i . 

. i 

1 

I 

I 

~ 

·; 

are u folJ.owa1:. A •et ot tive cam wheele 41 'I, a, 9, and 10, are mowd-4 upOn ! . l '.• 

a ooaaon· Alt.ft. irl '-Pon which they are lncU.v1dually tr• to rola.\9.t '.··.Rigldly 

·,.·; .. 

·· ... ::\:: ... 

.. ·,, . 
. ,''; 

... 

l 

:·l 

::?. ; ,, ··j t,. ,, 

'.\, 

I' ,·; ... ' ' j ~· • 

,, .. 

... : , . . ,. 

> ' 

,i 

' ~ I 

REF ID:A521740 

triftn .bf p&Wll '12, 73, 74, 75, and 76 Under the aotion ot magnets 77 t '18 1 

ff, 80, and 81• These magruJta are actuated by a set of olrc\d,ta haying a 

-.On ~umduotor 134, in which ia ·inserted universal keyboard c°'tra.ot 34:• 

'' 

laeh ~\ehet h~a a.ditterent number ot teeth, the numbert;t preferably••~ 

' : ·' 

51, so, t9~ :47·, and 43 teeth, reapectiveiy• The cam wheels aiea~iated with ' ",·:· 

the varioue ra\,oheta are ot diameters and have their periph•des .d1ddttd \lP . ··-.·. ' 

into nUl,llbera· of sepente corresponding wt.th the numbers ot· tetth. ' on the..~tahet . 

\o Wbteh ~b .~wheel is attaehedt so that. tor example, °'. -8"1 $J.~ "~ta . . . . . 

pert.~1 dlvid.'4 up int.o si equ.al eepenta 1 oam 'Wheel 1 has ite. ·~llbert ell- ··~· ,·. . ':' . . ' '. ·. • ·:~. :.- . • ! 

.. ,,' 

·tj4tc1. ia~) £ato 50 tqual segments, and so on·· Tho segments on· the ··t1oua oam ', ' . t: ' ': t • ' ' ' • • • • • ~ '' • • 

: !.: . ' : ::.~ .. - . 

·mamNrec:t 110. that the eet ot cam wheels can be aligned to a beach mark aocording ·:· 

too a·~~ key. The • ...-. at aaoh oam wheel are ·~·~~· W··':lato : ' . . .: ' ~ ; ". 

tllee• 1lote ar•: inurted small al1dable plates. These platea·_.ae ol two ·1ona1 : ·~ .. ··:· 

·~·.:;:.· .. 

·a Jlat•~:~'\b· a:;:~• surface, eo that when inaertld 1n th• el.: .. l:l• '°' aurfllt• .. : 4/.".: :· }·.- . . ' '.:!.:' · ... ···~'/.:~.' :, .. . " . . . 

U, ti~~ with. ~. ~ ot the oam wbeel1 a plate with o. butto~ o~;_::}.ongt~'~ .: . ;' ~<:~· . . "\;·." . ~.~:::· · ..::::.'·.'':·' .. : .,· .. ~· . ' "_r • ' I; ' ·~\:: ·, • \ ': ,• ; I 1.l·~ 

rib ~Jming·.·,rom its upper eurta.ae, so that when ineeried S:n· ·~ti sln thlt ' ,' ._. 

'"-'toa .OJ. rib 1.P~Jeots aboTe the rims of the cam wheel• . The ~rib\ltlon of 

-~~l~·· which are h• tnaeFoc in.aoh - ~~,o---itui• 

. . "· ··;. . ~ ... 

,. 

';, .. _ 

. .'· ~.-. 

..... ' 

' . . . 

; ~· .. :: 

. '' ' ·.: ·_, . .,,. . ",',.,I' . i•. ',/ 

.;': .· ·, 

·,,:_.; ... :··. 

,;:; 

I 

l· 

I 

I 

! 

l 

t 

j 

I 

, 

'· 'l. 

'· 

' I. 

i 

•.j • 

;' 

1'" 

! 
' • '~ J" • 

REF ID:A521740 

I I 

cont.act levero 86, 07 9 SO, 89 9 and 90 e.nd their respective contacts 861 81• 

I I · I 

as; 89, and 90; that is, when a plate with a button is presented to contaot 

I . . 

lever se·, tor aXAniple, the button serves to olooe contact 86 • otherwise. that 

tontact remain~ open• Contact levers 86, 87 t ea, 89, and 90 control &teppini 

magnets 11, 12,:::13, 14, and 15, which operate the stepping m~~iums or the 

cipher oommutat.ore, in e. manner presently to be explained• 

With th9 arrangement of cam wheels sh.own in iig• l, the •tj~·ognphia 

·,,· 

period ot t~ ass811lbly of cipher commutators lo equal to the pr~~n or th& 

with th• muiibe~e of teeth being 51, 50, 49, 47, a.nd 43 ntBpectively, the period 

.~ . . 

,• j' ' 

. Th•. fi~t atep;'. ot course, is to set the. cryptogra:(A1 to the pred.@•~ed key. 

Tbs.a· OOG&Priaea the following elements 1 the boriaontal permutatl."1 or arrange.-

&DQ.t ot: o1pher :o~tatore on the shaft t the rotatory alignme11t of· the oommu- . . ' 

l . 

. . _1: 

•'I ~ • ' 

t,a;tor8t·; UOQi'd~ to a group or 1-tters aligned on a bench -~kf\1'9 .~ die- 1 ·, ·t~:\~ " . ;.-.... ·~ ... ::''.~.· ... . · .. : ..... · ' : l [i·.:.: ' ' . . ' : ·, . ' .. :· .\ );'·:.' .:: ' . 

tr#.1-l\·l~· ot 'ti.ii two types ot elidable ptate& to be inserted?~ '~·: &lOt•. on . ·;·::'.: ' ' };: . ' . ' . ~}>·:·-::·::. :°<'.: ' . 

the cam' wheelfi:~, the rotatory alt.pent of the cam wheels aoo~i-di,. ·to a"group .• :.~ . 

. ,, . 

k•y1M:lar4 a·ow-1'\0nt flow tram battery 46, along oonduotora • .,; :.a~ to closed . •'. 

··'.'::; . 

!' 

: • . . ,. 

.·' 

~.~·:. 

\' 

· .. 

•·· 

.• 

I 

L ;.f 

. t1 

:' 
" 'L 

. l . I 

t . 

REF ID:A521740 

oontaot 49, oe>nduotor 41, contacts 37, 42 9 conductor 50, oontacto 51 on the 

left end plate of tho cipher commutatora, thence through the cormnU'\ators 1 

I • • ' 

.. · :". ~ . 

emerging at contact 52 on the right ond plate, conductor 53, contacts 44, 38, 

oonduotor 43, to lamp or indicating device "Y''', conductor 54 back to battery 

46· Upo1a re~e ot key "A'', and at the end of the rot um e~telon. or back 

1troke ot a universal bar on the keyboard, universal contact ~4 1•. aloeed aiad . ~ . . 

. ' 

a cirouit is passed through the set nr magnet& 77, 78, 79, 801 and Sl, oauslng 

the iawls 72, 73, 74, 75, and 76 to act so that oam wheels 6,. 7, a, 9, and 10 

are advanced one step. A eingle magnet can of oourae be ueed · fGr· thie purpose, 

with meohanicai meano of aff'ect ing on.ob pawl. The uni verso.l keyboard c ontaot 

·~.\ 

e!.rcmlt includes relay 91 which controls contact leve.,.. 92 and tontact. ~3• 

wbi4h ·111 in the ol~uit a ontrolllng magnets 11, 12, 13, 149 .U.d ),5., so thai . ' . ·.... . .. 

\ ". ·. ' 

OQrnmt:: can paae through the latter magnets only at tb' insttU:ft; When·· the. uniyetltffl contact : is closed. When the ·cam wheels 6, 7, s, 9, tUd io are ad'8Dffd 

o• e't.•1• a new ooinbination or operative and inoperative oon~a<!i levers SG to 

to and ot open :and closed contacte 06~ 87~ 80~ 89! and 90' 1a· set_..up, and oer-

·,..~ ... g th~f~o magnet• 11, l~, 13, i4, and lS are aotuat'!:'•;·}lh•• "cintrol 

': '..· . · .. · 

a .,. )>.8!th tb~gb the comutators tor the enciphennent of the.·~xt letter. ·. ., ·, . ... . ' 

T•. deoiph'~r the mefHJo.ge, screw 65 ie r-evolved to set the .. BWJ.:tcb plat• 94 

·to thct dffl~ring poeition. The oipher commutator& and the 'oalll 'lliheel:a muat 

i'' -.. ~ . 

. ·.·:· 

... 

. _?.··. 

.-.'.:". ·.-

.. .. 

. ··:, 

•,,· . ' . . 

. : ~ ; 

' _.. .. , 
REF ID:A521740 

ot OOW"Se also 'ff returned to their initial position and arrangement 1n en• 

ol)l)lering. It is unnecessary to trace the deoiphering oircu1ta U1rough, ainoe 

..... 

t.hil llhaae ot op.ration by means ot a rewraing n1tch is well ~ 1n the 

art.. 

It would bi -.sy to provide msans, oone1st1ng ot a simple e\VltohbOal!'d 100 ' . 

. with a plug and Jack arrangement tor conneoting contacts 861 t~. 90' to- mapet• 

11 to 15 in any o• ot 120 diffe~n\ pennutationth 

tn Jig. 1 l have shown an assembly ot but five cam wheels, o~ for ~h 

. . . ' 

t»i1pbe~ 0018111l~at0r. But it is readily possible to have a set of. t_.. cam wbeela . . 

which oan ·b9 .-e1'otrioally combined into five paire to oontrol th~ .·five cipher 

,,, 

. . 

o-.tator*. Thia 11 •hown eahematleally in rs.g. 2, ln wh.lch 11, :it• 13, 14, 

8IMi ·15 ~· the aiadlarly numbered ma.gneta ot rtg. i. for oont~lllng tbe .. ~.•ppiq . . .. · -~:. ' ', : . 

uobql1m1 ot the· o1pher aOllllllUtator1. Contact lover 8G 11 the . .._ • .s t9-

• 

eimllarly nulnMNd contact lever ot 1'1.g. lt exoept that this leye~ le now aa10• 

. .: ' ' . olated wlt.b two oontaot1, a lower ctontaot as. against whiob l~, n.onaally rests. 

and an uppel" oo~aot 86" which it touches when a button on th.• oam wh~l le 

prea-~ to tbi. OGAkot layer 86. Contact ltt'ler& 81 • 861 89t/and · 90 are Of 

·.·:. . ·. . . :'(: .. ·:. .· .·.· 

IO'ltAi.o 91ad.larl, mambered levers ot Fig. 1 and, like •onto.et ·~. 86 .of fig •. a, ~· ' :· . .' •;. . . . ... . . . 

t1le1 an each aeaoolated with paired oontaota. Contact lev81"&::~6, 187 t 188, . '..' .~ .. 

181, and 190 are·' t1ve additional oomact levers similar to 86,, 8'1, ea, st, and 
·~ ',' ' ,· " i 

REF ID:A521740 

there are now ton oam wheals and t.en contact levera. It the num'bva ot aegmeat• on: oilrn Wbeela a, 7, a, 9, and 10 ot Flg. l, are as ind1aated befort• 

namtly, Sl, 50, 49, 47, and 431 the numbers of ttagmenta on the adcUtiC)naJ. 

period. ~t the ~ola syetem ot cam wheels in thla oase would ~· ·51 a 50 x 49 x 

., • 48 • 41 x ~1 • 31 x 29 x 23 • . ·.· 

la 1.lg. a,. th• switchboard 200servas as a means for intel'O-ormeo•1ng t~ 

bJ a 111ait.l-.uc1e ot ditterent ar!'Nlpmentu. so that the tlve ~a of paired 6en-

"-' i..,.. oontrol the five magnet• 11, 12, 13, 14, and l!S b" a:·_;as.~ relationalaip .i~ below. ror example, as interoonnected in fig. a. ma.p.t ll ie 

oonirgJ.ed Jolnll7 by oontaot levers 86, and lS7J magnet 12 is. ·oQIS\roll~ J.os.ntly . . ' ~ •.' . 

~ .. '. 

l>y' oo- 1••~ 188 and 1891 magnet 1a,. by 90 and 1861 magn·t·_ 14. by 88 and . ~. '. . . . . . 

iuly -."red nla1 on Fig. l and eerves the same tunetion, . .-maiy', to apply ~' .. 

. pot.at&a1 'o t.ll._ oirou.Ua ooratrollod b)' oo.ntaot levers SG, 81 ;~. $$•~ 49t tO, la&, . : . '·:~~ ·: -.. :~-.. ~!·.i:·~~- .. . ' ... I ~ '. • ." •. • ' ' 

18f, 188. iet •. l.'° 01111 on the baok at.roke ot the univereal ba:t,_. ~:·.t~ t11board. ··.·>.··.: : ":.: .. :· . :'.·{: .. _- :. ~ ........ '.. •'. . : .·· ·: . . ... . .. ~ . 

. ' '"'"', '• 

. ,' 

the manur !D which a magnet ll ot Fig. 2, tor example, i:i•Qen~roll-1 by 

. ' " . . 

lt1 t~rarlly ~asoolated contact levers, in this oase 86 and 181, is a9 tollOW9• ~ . . 

••• 1 •. • 

. . . ' I. 

Suppoae oo"'act ·leV.r SG ie at its lower posit.ton, against con~ct'.· 8' ~, thel'e 

~ " th.at momfn' on the per1pherJ ot the first oam wheel· •.~·.P~te wldQb s;.: .. ·. . . 

1_ •• 

. ' 

· .. • ,·. .. ,. 

:·~· . . . 

::_-·.· .·· : .. ·· . 

.. ·. :· 
REF ID:A521740 

lwer fl&J that at tho same moment oontact lever 187 ie at ! t• uppor · poe1U.ott, 

~ . I 

againet ;~• upper t*ontact 187 , there being at that momcimt. on 'ho periphery -· . . 

la •ataltllehed·:'~thus• battery 331 oonduotor 126, contact lev ... ;~ of rela, 

911 · width le ai that moment energ11ed from the keyboard as explaiatcl a.b,.., . . 

., 

·ooniari· ·93,. ooiiduotor 26, oontao• aG', oontact lever 86, oond\ift~r 12T, tleslbl• oonduotol" 128 of ewitohboard 2001 oondu°'or 129, through·.~ U,. conclUOt• llOt tl~ible conduotor 131 or nii.ohboard 200, oonduc'or 133• oontaot ' ·· ... 

., 

... 

' I .. , 

(1): Contact le••r 86 ls making oontaot at aa whttt oon~a,~. 1-¥11' 181 la 

makiq contaot at 187~ No circuit rill be ntabliehed ._ihrough magnet 

· .:.. 111 beotlue both l•ven are then eonll&Of,ed to the ~· :914• of Ul• · . ~ .... : . ' 

'-:. 

'. ... ' . . . . ' ., ... ' . < ... 

· .. ' .. ··:·'. 

·(a). Cont~t lever 86 1• making oontac\ at &e~'llfun ·con~~~·;}~ .. ,. iav 1• . . ·, .. : .. ·· ·.ii,.;,'·;. ' 

mald.n• eontaot f!'t 187~. A oirouU will be eatabllsthed through 

...... u .• . ' ... ;· .. 

' ' . ".,·, ··.·.:· .. " '• •. ·· .. 

' ' . ' 

. makilsg ocntaot at 187~ A olrouit will be establ1~--~. th:ro .. ~saM 11. . . .. ~ .. r-1,1 

' ' ~. . 

... ',• .·. '• . 

. ·· . . -... 
REF ID:A521740 

(4) Cont.act lever gg ia mald.ng oontaet at 86 11 when contaat le•GJ< 187· le. 

The Hine eat ot four aond1t1ons applioe to magnets 12, 139 14•' and 15 and 

'their uaoolated oontaot levers and oont&ota. .; ','. 

B, int.erehanging the oormeotions eatablisl\ed at. awitchb6&rc:r 200. great 

' . ' .. 

varlabilUy in tl•otrical afteota of the set ot eontaot levers 11 IAttorded 

tor oryptographio keying purposes. 

In f1g, 3 is shown a detail ot one ot the cam wheels, with 1ta 1lot8 301, 

' . . " IOI • The· plat,ea are provided with eprin.ga 304, 305 to hold the. plate 1n . ' ' . 

': ,'• .. ': 

·,·, 

:t . 

. ',·' 

,··.' : :·'. -: :; . ; .' 
- - -- - ---~-----:::-----------------· 

REF ID:A521740 

• ~CllllpJ'f.8ln; a ""' ot j...tapceed, rotatable a"""""'nt Ol'll · hr ""'11all 

th• oonr&edlona between the keyboar"d elements and eaid elpallng 9l~J 

...... • :'.', 

a Mt ot .._bearing rotatable m$Dlbo!"Sf means tor mplarl,..U..pl.eeS,ng 

. . . oNinated wJ.th fldd eet of cam-bearing mcm'b&n to ethot ~tattff, step. / . '. .. ' . 

" . J • 

• _. oomFi11q .a eat ot J~ed, l"Otat$ble eonwuta~ ~t lfU7ina ' .. 

. . 

\ht ooam941tion• betwen the keyboard e1t91D81tts am eald 1lfPitJS09 ..-,, 

·.r·. 

•PM ·~ ot said keyboarit -4 meallG ooOribating ~ ..,.btarinl ':: < 

.... 

_.,_. wtt~ the commuta\ore to etteot pennutatlv.• at.Pit. •. 4'a,i.aoetnto /'' \ . . 

,·. 

';.' 

.· 

'' 

.. : ... · 

':.:, ·.:,· ... '• . 

....... 

' .! . 

. --~ ., 

\ 

I . 
REF ID:A521740 

~-,·the -=-bearing 11911bera being eleetrioally ae•o,la.14 with the 

·. .. .: 

,. 

·;·, 

of tho o~trtors. ·- . 

.•' . 

. '. , .... 

' o,_.tlye ·•lfftrS..oal connection wt.th oorrapoming s1palbig fl••ti:·f llltlUW 

.. 

· ;,.. .. o:t:,::~ih• ·k.,a or •14 l•r~i •• _. ooorcU.niitJ.UC'.··eua --~ ot 

. ·. ,• 

.-.. , .......... _.. to •ftect pom\atl~. ettPWi•• dlrip~• # .th•·.:· 

. ' .. .. ' 

J~ato,..::~. 

, ' . I• ln ., oz-ntograph• a ktylloari ocmpriaing obal'acter '.~~· b . \ ' . . '. . . '~ : . . . . ,:· 

' .. · .. · !;.: . ··:··, ···.:·.:.' .. 

~ .£~·t· ·~i Jwcta~ecl, ff\a\&blt oOD11Utaton for·~· tk..·o• . · ... -~. ". ~ .. ,.; . ' . 

' !·,.· 

aettlou be\~n the keyboard e1118eftt9 and aald atgnal.ing ~i~a1 a pluI . 

~t). ·Of ~Maring meMrlt meaaa tor etteoting 8'epttlat.up:l.ar ~dl•plau-

- . 

,....,-14.~---·~*~·"' ~., .. .. _., a ..iee et eommutator n9PPins ·uoha11tDS· ea.ob ••.W4t'8c ... .i.ot..o.. . . . : . 

.. ·. 

: " : 

" ~ 

' . ' 

... 
REF ID:A521740 

magn.t a~d an associ~tod ratehet and pawl, each ratchet and pawl actuating 

Ue atu1ociated COT!mrutn·tor, the eet ot commutator stepping meohanima being 

controlled by the su1d. 0~1n..beari11g members ae9oolated ns a ~roup ooard:tnated 

colleetively to effect panr.utativa, stepwise dieplncernents or the camiutators. 

a.. A meohaniS!!\ of' the character deecribed 1n claim 5 :tn which the perlph .. 

ery of oaeh orun-benr1.nr.; member is divided up into equ.-".l.1-spaced segments, the 

numbere of sepientm on the respective com-bearing members being prime to one 

another • 

. 1. In a eryptographt a keyboard comprising cha~cter elements in operat.ive electrical eonnoction with corresponding signaling eleinentst means c<1Dprielng a. eet or juxtaposed, rotatable c·ommutator:s for varying tho connect:l.ona 

b.-twee the keyboard eleme.nts and 'aid signaling elements; a eet of eommutat~epping. im ohanlsmo corresponding in number to the num'be:r of conmmtatare1 

a ~et· ot contact lenrn rutd aaeod.atod oontaot• controlU.ng the operation of 

Rid eommutator stepping m~hanitml9, said contact lovers b91ng opented by 

a eet ot rotatable co.rri.-boaring membersJ and means for angularly displacing 

eaid· cam-bwing members upon suooeesive depreeaiona or the keys of •add 

k.yboard. 

a. A meehanism ot t.he eharmcter described in claim 7. in which the 

9, In a cryptograph of e. character <h'84Srfbed, the combination of key-
REF ID:A521740 

boa.I'd elements end signaling elements a a eet of juxtapoeedt rotatablo oommutatore f'or ftrying the oonneotions between the tvro aeta ot elementet a eerie& 

of ommutator stepping mechanisms f'or d:leplacing the reapect:l,._ canmutatora 

in a 1tepri.se manners a set ot cam-bearing membera tor controlling the acm .. 

mutator st•pping mechanisms to effect the etepwiee diaple.oemertb of the CClm• 

mutators in a permutative mannert nnd mesns for affecting stepwise displacementa ot said cam-bearing members. 

10. ln fl cryptogreph of' the character deseribed, the c,embination ot 

keyboard eltnent111 and signaling elementeJ a set ot Juxtaposed rotatable oom .. 

mutator& tor varying the connections between the two sets 'Jf elements 1 a 

•-' ot oonmutator stepping mechanisms for d:i.splac1ng the tespeotivt oammuta ... 

ton !n a attfpwiae manner1 Rnd a plurality ot rotatable oani-bearing mambel"S 

tor ctolleatiftly oontrolling the oommutator stepping mechad.sma to etteci. 

th• etepri.ae dieplaoemente ot the commutators in a pel"l!Ntatlve mantler• 

Ua A meohan1em of the o,h11u-aoter deserl'bedt ocmpr:leing a 1ot ot elements 

oonotituting the keybMrd, nnd e. set ot elements OC!lttitutins & signaling 

bank, 'aaid ens or elements being electrically interrelatedf' a set ot Justapoaed, rotatable nitching devicee for 'f'&rying the eleatriaal relation between 

t.he two aeta ot elements; and means tor effecting stepwise diaplaosnente ot 

the mtohing devices in an irregular marmer, said means ino,luding a set ot 

rotatable nm-bearing members controlling the atepwiee dS.epla.oamente ot the 

ew1toh1ng devices. 

"; 

' ·. ~ 
------------------:------------------- ::· '. 

REF ID:A521740 

11. Ia etom'bina.t!on a let ot chara.oter elllmtPnts oonatttu.t!ng a k•yboardt 

. . 

l.Wrpoted bftwe., said nitohn and oaid tranole.ttng devl•os i-e-nclertng _-

4"'1•t end}'.M~~uu! operable 1n respono11 to eatJh key opsratl0n -~- .1alfftiag - . -

a group ot said paths, ea!d latt named moans compddng a oet ot oontaot 

: ' ... 

lewra·and a.Qeocdated contacte oontroUed by a:p1uraU.ty ot ntatable OU1-

num'*"8 ot cai'lS on the respective eam-boar1ng members beinC prime to one 

.:.··. _, 

. . . •11• In CQDblnatton a ett at chanLOter elements eOl18t.utinc-tbe ·NY"" 

· ... · .' 

boM4;f awiteh individual to eafh elemat and operable ther'(t°bYI a 4'C>rrffpik'ld-;. 

- - . 

tnt•rpostd ~wen eaid "1it<thet nnd eaid tr-enslatins d&rtO'.~ _M1ftd$r1ng ' ·,. . 

al'Bl1'ble a cp1ttpl10ity or •1eotr1~al patba -bet~ said endt~hee llud said . - . 

of_,lld.4 -~~Ung dedo•, ald •1"• OQUpri.aing ad~u,~1/.-i' .0..- . . ~ . ,: . ' .. 

neo...n. Wberiby the wiring •:re•em ma1 be given an Wt1al lf.,tttng-~41ng \ .. · ',· . '. 

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In my prior application serial No. 6B2,096, I disclose a cryptographic 

oystem and mechanism, th('!! bs.sie feature of which is the provision or means 

tor a.pariod:tcally controlHng a !'let of ju.xtnposed f.tvrttcM.ng or cipher car.mutntors giving cr-yptogra.p1deally n ce.~cn1.t& ot"feot. In ths.t system the mer.tns 

referred to involves th0 uno of n cipher-key tmn~mitter through which a pnrrora.ted key-t~pe io paasod. 

The objeot or this bwent:ton ia to control the ;1nxto.posed cipher oanmutatore by meana or nt1 A.e!'looiatod sat of cam wheels of ditterent diameters, 

thus diapenaing with the perforated tr1.po referred to above. 

The invention ie tlei!lcribsd in cormat'.rtion with three drawings. Fig. 1 is 

a schematic diagram of tho mechaniRm. including n Ro·t of five crun wheels controlling a corresponding number or elactro-mngnetic, stepping ~evicas tor 

oftecting angular di.splnc911"tont or the commutatol"O. ll'ig. 2 ehows paired oircuits 

corresponding to a set of ten cam W'he~le for eloctric~lly controlling the five 

eleat:ro-magnetic, atep!'ing tlevtoee of Fig. l• togothor with switching means 

tor interchanging th9 elactr:i.on.J. oonditiom~ met up by tho cnm wheels. Fig. 3 

gifts some doto.ils or a earn wheel. 

Referring to Fig. 1, there are nhovm the followit't~ elements which a.re 

well-kn0"'1 in tht art applicabl9 to r:1odern cryptogmp11s employing rotatable 

oipber conmutatoMu The numeral 1 generally deeignatos a standard typewrit•r 

keyboard provided with a set of koys for closing n set of contacts corresponding to oharacter elements; tha nur:1eral 2 generally designates e. bank of record-

-1-
REF ID:A521740 

ing or 1.n!licnting devio91't which m!'l.y take the rorm or a. sot ot magnets of a 

printing mochanism, or a Ht of glow lamps to indicate by illumination of 

auperimpoaed lettering thl!I ehn.ractt.tr equivalents ~·nnulting from operat1cm ot 

the keyboard, 3 generi\lly designat,.eu " eet or Juxtapooed, rotatable circuit 

changers constructed hi the tonn of switching coron1utators oonlnonly called 

cipher commutators, mountable upon a eomrnon shaft and arranged to rotate 

relntive to one A.nother. n.nd to i"b:oil on<l plntee, in order to provide a large 

number ot vn.rlable paths rnr the patJnnge of an electric current representing 

a message character aot up on ·~.he k"yhoard, the 9xnct pa.th tmve•s&d in ench 

instance being detenrd.n6d hy tlrn relative rotatory positions ot the whole oet 

• 

ot oiph.er oommrt.ators r.lntl and plA.toe at thnt instant; 4 genBrally doaignatee 

a set of stepping mechRntsma fo:r e:t".fecting angular displacEJ1nents of tho cipher . 

commutators. Tne esuence of the pranent invention consists in the provision 

or means, indicated generally at 5, tor controlling these stepping meohaniems 

through the intermediaoy or a set of pawls and ratchets, and 081!! 'iiheele aasocia.ted with the ratchets, the came opening Md closing circuits tor operating 

the eleriro-magnetically controlled etepping mechanisms. 

'the most important elements ot the cipher commute.tor control asaembly, $, 

are as tollowa1 A sot of five cam wheels G, 7, 8, 9, and 10, are mounted upon 

a oommon shaft 71 upon which they are individually free to rotate. Rigidly 

tixed \o each oam wheol a.re the respective ratchets GG, 61 9 68t 69, and 70, 

-a-
REF ID:A521740 

. ' '., l,.) \'··~ ~: " t: l, .. ' •: j 

drlnn by pawl.a 72, 73, 74, 75, and 76 under the aetion or magnets 77, 78, 

79, 80, and 81. Those magnets nre actuated by a sat of circuits having a 

common conductor 134, in v~1ioh is inserted universal keyboard contact 34. 

Each ratohet hrie n diffctrent number ot teeth, ·the numbers profernbly being 

prime to one Mother. l"or example, let ratchets 66, 67 9 68, 699 and 70 have 

51, SO, 49, 47, and 43 teeth, respectively. The cam whf.ll!tls a.&l!looiated. with 

the various ratchets are ot diameters and have their peripheries dividecl up 

in'o numbers ot segments correapor.uHng with the numhers of teeth. on the ratchet 

to which Gt.lob cam wheel is attachedJ so that, for example, cam wheel 6,hau its 

periphery divided up into 51 equal segments, cam wheel 7 has its periphery divided up into 50 equal ae"11tlmto, and so on. Tho oegments on the various aam 

wheels are mada of equal Angular length and, tor keying purposes, they are 

manbered 10 that the &Gt of cam wheels can be aligned to a benoh mark aocording 

to a prearranged key. The s.entlll of ~&.Ch cam wheel are slotted, anu into 

th•& alota are inserted 8'11V1ll slidf.lbla plates. Theae plates n.re of two eortsa 

a plate with a plane surftJ.ce, eo thnt when inserted in the slot its top surhc o 

is fluah with .the rims or the cam wheelf a plate with a button or· longit~dinAl 

rib projecting from its upper surface, so that when :1.nsorted in the slot tb& 

button or rib projects above tho rims of the cam wheel• The distribution of 

one or the elC!Jl'llents or the cipher key to the system. Thene platea control 

-a- ". ' •· I ~ • • .• \! '• " ·~. ll• -

···,' 
REF ID:A521740 

( ( 

contact lever.l!I SS, 07 11 f1'"', f:l9, r.md 90 nnd their respnct:lva contl'l.et.a 86, 871 

aa', 89~ and 9o't tho.t. is, when a plate with a button ia presented to contact 

lever 86, for exMlpla, tho button ~HH'Vet? ·to close cnntnct 061 , otherwiso thnt 

contact rema-i.no open. Contact lt"Jvars 06, B'l, aa. H9, 11.nd 90 control stepving 

magnets 11, 12~ 13, 11, ~md. 15, w;deh open1te tho stepping raechai'lieme of the 

cipher oommutn.tore, in n mnner presently t;o be axpln:l.mnl• 

With the armngeroont of onm wheeh aho">m in Fig. 1, t.ho cryptographic 

period or tha assembly of cipher commute.tore io equal to t.ha product or the 

numbers ot teeth 1.n th., Mt of rat.oh~ts 66,, 67, 69, 69, and 70. In this oase, 

with the numbers of te~th being 51, !.iO, 49~ 47, nnd 43 raspeetively, the Jiodod 

18 252,523,950. 

The manner in wh1.ch tho aystarn n.rJ ~i. whole functions will now be described. 

The first step, ot couroo, 19 t.o sot the cryptograph to the predetermined key. 

'nl11 oomprioes the followini~ ~leiments: tho horbontnl permutation or arrangement or cipher oorn."11Utntorn on tho she.rte the rotn.toi•y alignment or the commutato:ro, according to a fr,roup of lettara n.lignad on a bench rnarkJ t·he exact dietrS.bution of the two tyros of olict.'1.hle pla.tOIJ to bo ineerted in the slots on 

tho cam ,whOt'\lSJ f.ha roto.tory "li~(\)nt or. tha cmm 'meolo ao~ording to a group 

Qll'chamoters~ nlignfl)d on a bench 1m.:rlq fi.Mlly, tho cryptog:raph is set to the 

eno1pher1ng positi()n. =,<nrnn tho key corresponding to "A." is depressed on the 

keyboard. a cur·rent nO'lm from battory 46, along conductors 47, 481 to closed 

tONf lD[Nl\/\L 

.......... _.. ________________ ~~~----~-
REF ID:A521740 

i; '; , .. !\: l Ti J'j ·, 

oontn.ct 49, o·onduotor .\1, eonte.ots 37, 4211 conductor ~m. contaets 51 on the 

left end plate of the ciphor commutators, thenco through the commutators, 

emerging at oontnct 52 rin tha ri~ht. 111nt.l plnte, con.-ludor 53, contactllil 44, 38, 

conductor 43 9 to lo.mp or ;.ndicatinrr, dovloe "'{ .. , 1!0n1luctor !34 back ·t.o battery 

46. Upon relan.tH) or key "f\"' and a.t the And of tho rot um excursion or back 

atroke or n t.miversa.l l):.\r on the ke;rhrm .. rd, uni.voranl contact 34 io closed and 

a circuit is pasne<1 through tho Bet of l"ll'l!~1~tfl '17, 731 19tt 80, 11nrt 81, 011using 

the pawlo 72 1 73, 74, 75, a.ml 76 to net GO that Ctltlt wh1101s 6• 7, S, 9, and 10 . 

ara advanoed one otap. A etngle r.m..~et e~m or course be used tor this purpose, 

with mechanical meane of nffeotlng onch pmwl. The unlvorsal keyboard contact 

circuit inoludes rela.y 91 which ennt.roln contact lovor 92 n.nd eontact 93, 

which is in the oirollH controlling magnets 11 9 12, 13, 14t and 15, so thnt 

current cnn pass th:<'ourr,h the lnttqir riagnets only nt the instant 'lrilen the uni .. 

versal eontuct is oll)sed. \'.:'hen the cam wheels 6, 7, s, 9, nnd·10 aro ad"lflnoed 

ono etep, a oow combinr:ttion of. ope.r.r1tive a.nd inoporo.tive contact levers 86 to 

I I I I I 

90 and or open and closed contacts ao, 87, aa, 89, and 90 iu set up, and correa))On<ling thefoto ma~ets 11, 12 1 13, 14, and 15 are actuat$d• • '.t'hese control 

the displacement mechnnhrns asaociated with th~ oipher commutatorG am set up 

a new path through the conmu.tators for the encipherrnent of the next letter. 

To deciphe~ the measnge, eerow 65 is revolved to set the owitch plate 94 

to the deciphering po1Jition. The cipher commutators and the cam wheels must 

-5-

. :.-··' 
REF ID:A521740 

. - . 

i ,-. ; '• ~\ =.~. l 11 ,1 ~ ~ ', 1\ ~ 

, ,, f, :~ f; ili.J LI':\ \I ·' 

or oou:ree also be returned to thdr initial podt!on and arrangement in enciphering. It is unn~cess~ry to tro.ce the dociphoring circuits through, since 

this pbaae of operation by manns or a revoreinf~ nitch is well known in the 

art. 

It would be eo.sy t.o p~·0vlde meR.ne, eonsiatinl} or a ofotple ew!tchbMrd 100 

with a plug and jnok a1•J'l'l.ngem~nt for oon-r1eating eontaoto 861 to 901 to magnets 

11 to 15 in any one or 120 dlfferent p&nnutations. 

In ll"ig. l l httvo shllwn an assembly of hut tbra cnt:! wheels, one for each 

cipher oon:mutator. But it :la rendily possible to have n sat of ten CUI wheels 

which oan be eleotrioally oombin&d int9 f:ln r~:lrs to control the f'ive cipher 

commutators. This 1o ahown schmno.tieally in Fig·. 2, in which 11, l~, 13, 14, 

and 15 are the similarly mtinbered magneto ot Fig. 1, tor contJ"Olling the stepping 

meoha.rd.sma of' the cipher om:mmtato:rs o Contact lover SG is the same aa the 

eimllarly nwnbered eontnat levGr or Fig. 1, exe&pt that this lever 1s now asaoI ciated with two ooritacte, n lower contact 06, against which it nonimlly reots, 

and an upper contact. 8611 ~iich it touches when a button on the .eam wheal ie 

presented to the contact 10V$r O&. Contact levers 07 t OOt 899 &Dd 90 are ot 

th• same tonn as contact lover BG, nrul serve similflr tunctions1 they are homologoU1!I to aimil.&rly numberad levers of Fi.g. i ·Md, like contact lover 86 ot Fig. 2, 

they are each auaociated with paired eontact9. Contact leverB 186, 137, 100, 

189, and 190 are tive additional contact levers simllnr to 86 1 87• 881 S9, am 

901 tbey are associated with and opera.tad by fiff additional cam wheels, eo that 

-6-

. ·· .... ·~ . 
REF ID:A521740 

there are now ten oam whoele and ten conta.ot levers. Ir the numbers or e•gmenta on awn wheals 6, 7, a, 9, and 10 of .Fig. lt e.ra as indicated betore, 

namely, 51, so, 49, 47, l\!ld 43, the numbers ot segments on tne w:klitionai 

five cam wheelo may, tor exn,r:1ple, be 11, 37, 31, 29, and 23. The complete 

~riod. of the whole eyst9!!1 or cNll whenle in th!G co.!.le would bo 51 x 50 x 49 x 

41 • 43 x 41 x 37 x 31 x 29 x 23 • 

ln Fig. 2, the switchboard 200 aerves as n. means for intereonneatine: the 

contact lners 86, 97, BB, 89, 90, 186, 187, 188, 189, and 190 in pairs, and 

by a mulU.tude or (lii'.farent a.rrangen1onts, ao that the five sets of paired contaot levers control the fivo magneta 11, 12, 13, 14, nnd 15 by a. ~1.red relationeblp uplainad below. For oxample, a.a interoonnected lrt Fig. 2, magnet 11 is 

oontrolled Jointly by contact levers 86, and 107J mugnet 12 is controllocl Jointly 

b)' oon.taot levers l8B and l.89; magnet 13, by 90 and 18Gs magnet 14, 'by 89 and 

1901 magnet ls, by 67 imd 139. The rela.y 91 in Fig. 2 is the aan:ie u the si:d.-

larly munbered. relay on Fig. l 1'.ll'ld eerves the same tunction, namely, to apply 

potential to the circuits controlled by contact levers 86, 67,. aa,. 89, 90, 186, 

18?, 188~ 199, 190 only on the be.ck stroke of the univoMml '17.lr on the keyboard. 

The manner in which n mai~~t 11 of Fig. 2, tor oxample, is controlled by 

1te 1-emporarily aosooia.ted contact levers, in this cnae 96 and 197, ia a.a follow. 

·.. I Suppose oontact lever 86 is mt ite lower position, against contact 36 , there 

being at t bat moment on tho per1ph@ry ot the first cl'U'!l wheal a plate which is 

-7-
REF ID:A521740 

rlush with tne rim or th~ wheel, thn.t is, no but.ton is prPented to contact 

lwer 86t· that at tho eamo mt:'mlent contact lever 187 is nt its uppor poa1t1on, 

I 

against i~a upper cont.a.ct 1S7 , there being at tlmt moment on the pe~iphery 

ot th& seventh cam wheol P.: rla.ta which bears a proJseting but.ton. A. circuit 

ia aatabliehed thus1 battery 33; conductor 126, contact lever 92 ot rela1 

91, Which is at· that momen·li onllrgised from the keyboal"d as eiplu.ined above, 

I oontaot 93, conductor 26, aontu.ct 8G , contact lever ao, conductor 127, nexlblt conduotor 128 ot .sw:i.tehbonrd 200, conductor 129, through magnet 11, conductor 130, flexiblo condractor 131 of switchboard 200, conductor l!a, contact 

197'' against which contMt. lever lA7 ie now reat:lng, CO'l'lductor 133, b&ok to 

bat\ery 33. Magnet 11 is energi1ed. It uill be ooen that mag11et 11 is subject 

to tour condUions i 

(1) I Contact lever 8G is a~kin~ contact at S6 when contact lever 197 is 

making contact at 187~ No c:l.reuit will he eatn.bliabed ·through magnet 

11, because both levers are then connected to the same side or th• 

(a) Contact lavar 86 is roak1.ng contact at Bo' when contaet lever 187 is 

making c ontaot t\t 107 ". .'\ cl rouit will ho esta.blisheil through 

magnet 11. 

(3) fl Contact lever f.16 io rnaking contact nt 36 when contact lever 10'1 is 

making c cnta.ct at 187~ A circu.'lt will be eatabliehed through magnet ll • 

.. , , ... ' 
REF ID:A521740 

(4) Contact lover !36 18 milking contact a.t SG 11 wh.,n contact lever 181 ls 

If making contact at. lB7 • No circuit ir.i establ1"hed through !18.gnet 11. 

The same sat or rnur oonditiona ri.riplioo to magnet9 12, 13, 14, and 15 and 

thtir aoaociated contact l~tVere an:l contacts. 

By interohanging th" connactio11r. turtablish&d nt switchboard aoo groat 

variability in eleatricttl .;>fraots or tho se·t of oontn.ct lovers 1o afforded 

tor eryptograph1o koy1ng purpooes. 

In Fig. 3 is shown a dotni'.t o.f on<J or the cam wheels, with its slots 301, 

removable plate& 302 9 a.nd ratchet 303. Ono or the plnin plates is shown at 

302'. The plates are provi•l~tl ~dth apr.i.ngs 304, 305 to hold thtl plate in 

pla.oe when. inserted in ·tho !Jlot. 

.,JJNf lDENTlAL 

::_··. 
REF ID:A521740 

the 001mectlona betwe~ri the keyboo.rd el~ta Md en.id oipaling elemonts f 

nae diaplaoements or t.he conmutators. 

2. In a oryptogrn.ph, a keyboard comprising characte.r clomonts in 

operative olectrical connection with corrGBponding signaling elements1 

ot tho coomutators • 

. operatiw eleCtricA:l. connection with corresponding signaling olecmte1 means 

-1-
REF ID:A521740 

, . 1.· i .. : I '1;.'. q; ~ : .. 

members upon operation or said keyboards and a aer!ee ot o~tator oteppin,g 

commut""tor stapp~.ng mochanismo to effect porniuta.tive, Bt&pwiae displaoemcnte 

ot the eanmutators. 

4. In a eryptogrnph, ia keyboard ooinprising character elEillenttl 1» 

operaU.ve eleotr1cal ctmnect1on with oorreepomUng signaling element.Bf mtMS 

comprising a sat or Juxtaposed. rotatable commute.ton tor Yarying the oonwise angular diaplaoementa or amid crun-bearing mombere with individual depreelioris of th9 keys or. said keyboardt am maa.ns coordinating said sets ot 

&. In a cryptograph, a koyboard oampr1s1ng cham.eter elements ill 

ope.n.tive oleotrical connection with corrsaponding signaling lll1'118ntaJ meana 

oompli.alng a· oet ot Jwctapoeed, rotatable commutators tar ./ary1ng the oonneotiona 'b~Ween the keyboard elem&nb a.nd. s&id signaling elemontsa a plubaer'4t a 1919lee or commutator etepplng meehanieme each COl'3prWng an tleotro-

. '"T' !fd LON{ \OEN ' U\L 

'· .. 
REF ID:A521740 

ma.gnet and an aesociatoo ratchet and p.."'l.wl,. each ratchet nnd po.111 actuating 

controlled by the o!lid eam-bem.ring memba1"9 associated a.e a group coordinated 

oollectivoly to ertoot pormutative, l!ftepwise dioplnc~ts or the cansnutatore. 

6. A moohanism or the ehar.acter deacr1'bed in claim 5 ln 'Which the peripherr ot eaeh ta,w-bearlng member is divided up into equal-spaced eepents, the 

numbere or segments on the respective co:m-bea.ring members bei.ng prime to ona 

another. 

tive ctlootrieal oonnectlon with corrosponding stgmling elSDents1 means camprising n eot ot juxtaposed, rotmtable oammuta.tors tor vr.trying tho conneetione 

Mtwee the keyboard elmnents nnd said signaling elements1 a so\ or eor:mmta.-

a aet. ot contact leven nnd tUHJod.n.tad contacts controlling the opera'tlon of 

a est of rotatable ca..,·boaring monib<U''Sl e.ntl menns for angularly dlapluing 

1a1d cam-bearing membere upon auoce&oive depressions ot tho key& ot en1d 

a. A moohaniom ot ·the ellamater described in elo.im 7 in Which the 

9. In a cryptograph or a ehrlmcter d09Cr1Md, the combination ot key-

-3-
REF ID:A521740 

t&tora tor varying the connoations between the two sets ot element.at a eerie& 

of commute.tor stepping meehnn:lema tor dioplaeS.ng tho respeoti'f'9 cammtators 

in a stepwise manner; n set of enm-bea.ring members for controlling the com ... 

mutator stepping meahan:loms to affect the stepdoe dieplaeC°:lm{9nta of the cOftlmuta'&ora 1n n pernrutat1v~ tnanner; and means te»" .affecting stepwise d1aplaoe10. In a cryptograph or the chat"acter de3cribed, the combina.ti0n ot 

keyboard elemento •md signaling elements1 a sat or juxtaposed rotatable commutators tor varying tha connoctions betwemt the ~vo aete ot element& J a. 

•et ot commutator stepping meoha.nisms tor displacing the reapeotivo oGDmUta-

\ors in n stepwise mMn&rf n.nd o. plurality of rotatable cam-bearing members 

tor oolleetively oontrolling the commutator stepping meohanieras to etf'ec\ 

conetituting the keyboard, and n. eet or •laments ctctlstituting a. signaling 

bankt said eete ot olnmenta being 0lootrioally interrelatedJ ri Get of Jwcta.-

poeed, rotatable switching devices for varying tho electrical relation batweon 

the t.wo aets of elementas end means tor ettectinis stepwise diaplaot'lnGnte ot 

rotatable cam-bearing mornbers controlling the etepwiso d1oplacem9nta ot the 

nJ.tching d8Yicea. oUiiF\DENT\Al -4-
REF ID:A521740 

12. Il'l comblnl"l.U.on n net ot aha.raotor fllltmftento oon1titut1ng a 'k&yboa.rdt 

a tnrl.toh individunl to ea.ch elomont an:l opornblo tboreb;n a oorr00:poncl1ng 

a'Yll.llable a mult:tpl!cUy ot ttleetricnl pn.ths between aid switches and ed.d 

dov.l089J rmd mea.'lD opBm.bl& in rosponso to each lr.oy operation tor selecting 

levers nnd aseocinted oonttl!.ets eo.n.trollnd by n plurality ot rotmtnble camboa.ring rnanbors angularly displn.~rn.bl!!> in r~sponse to e:tch ltey opero.U.on, the 

boardf switch indiv!dunl tci each olefm~nt and operable the.rebrr m corresponding numbor of translating doviC!l?S opernble by saicl elemen.tDJ a wiring aystem 

a'f!lilable a multiplicity of eloctrtenl path.is between said 8'1d.tch9s nnd said 

ct•doea 'l!lbereby on.ch nitch l'MIY h&oomo aasociatod with MY ontt or a plural1t1 

ot ttdd t,..l.at!ng dovioee, said system ctomprieing adjustably moveblo oonon~ electrical Jlflth for eaoh mrl.tcb' qd m&ans operable in reepeet to eaeh 

key opore.tion ft'lr chl\nging such settirig, said lant-nmaed meM9 comprising a 

.. 5. 

~ONFiOENT\ril 

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REF ID:A521740 

\;f~_:, ~\~ ~. : d~ .. 

eat ot ce.m-'baarln~ moMbertt a.l'l~.1.lnrly ,asplaeable in respons& to individual 

key opera.ti"n' a net or ~ontf:\.et levorm ttnd e.oaoclnted coatacto operated by 

ea1d eam-beti.r:lnij ml)mh!llr9, tal".id cont~ot lever.·s ri.nd conte.cte controlling th& 

usooi~t1on ot en.eh snid switch 'lvUh n11y one (1f snid l>lura.l1ty of translating 

dni.cea. 

CONFIDENTIAL 

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REF I ·D:~21740 V 
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REF ID:A521740 

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REF ID:A521740 

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