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WAR DEPARTMENT 

OFFICE OF THE CHIEF SIGNAL OFFICER 

WASHINGTON 

-- ~324 FEB ?3 PM 

Tho tollowinr; propoanls for modifying and irnprovine tho oiphor 

maoh1no subl'llttou to thle o:f"fioo for ex.oo1Mtion by the Habern Bloctrio 

Codo Compa~, of Oai\l:md. Cal1foru1a., o.ro heroby doclared to bo !olely the 

renul ta ot my etudy o:r the a:!oroauid mach1no. 2l11s oomoranuum is !or tlio 

purpose o"f offio1nlly rooor<U118 theso propoenls. Claim 1e ho1-oby made to 

all of thoeo propos~ls, or to n:rr; combino.tion o! them. tor tj1e United BtAtea 

Govel"ll!!lOnt, oonnorcinl riehtn being reserved for myself. 

I deaignata the ciphor vmeolB, 1.o., those oontnimne olaotrio,al 

w1r1:ne, from let't to right us one :t'acoa tho key-board, by tho numbQr:s 1, 2

1 3, 4, and 5, roepeotivoly. 

Thut tho mechanism !or n.utomri.tically advunoinc the oipho:r whee~" 

bo chuncod, by ~i!t!ns the proper doge on tho ehatt, ao thats 

Who el Uo. 3 is :rn.ndo to advance one stop per 

doproaeion ot any- koy; 

\ihoal No .. 4 is m.~do to advance one atop por 

ono OOMplete revolution of wbool No. 31 

\/hool Ui-1. 2 is rro.de t0 ndvnnca ono stop por 

ono complete revolution of W'.hool No. 4. 

follow: 

That all five c1phor whoole bo mdo 'to advance a.utom;:tioall¥ ~is 

Whcol lio. 3, ono etap per deproaoion of n.D¥ lmy. Whool ll'o. 2, ono stop po:r one complete :revolution 

of ¥/bool No. 3. 

Wheol J;o. 4, ono step po:rt one ocmpleto revolution 

ot i7beel ?to. a. 

\iheol No. 1, one etop por ano completo rovolution 

o:t \lhoal No. 4. 

Whool No. 5t ono stop per one a ample to revolution 

ot Wheel No. 1. 

Th11!1 h 'to be accompli:Jhed b:1 n 8u1 tab lo arJ•angooont ot aluml:qVm 

wheels, their a.dv:tnc1D(3 <,oge, and the adva.,nclna-dog oont:rol-lovore, -

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WAR DEPARTMENT 

OFFICE OF THE CHIEF SIGNAL OFFICER 

WASHINGTON 

That pl"ov1e1on bo ruJ.do tor ea.s:r chn:n13e., at -the will o~ tho oo~­

rospondonte, of the position~ ·of tho advLmci~ dogs on the sl1aft, ao that 

the corroapondents can regulnto tho method or order in ·which tho udvunaing 

of any Wl1eol 1s controlled. 

:eROPOSAJ.. UO, 4. 

That prov1e1on be ro:ldo tor oa.sy ohnngo. nt tho will of tho co:r-

:reapondonta, o:r tho position ot the notch,. rol~~tivo to the alphabet, on 

oaoh of tho n1Ul1'1inum miools •. For e:mmple, as now constitutod, tliO notch is 

nlwo.ya opposito tho lotter At a11ow111c the advanoine-doc oont:rol-levo:r to 

:fall into the notch whonevor the letter A on the aluminum ·;!heels rocchois the 

dotJ control-lover., ~ia now happens &a.ch Umo thut the Lotter N appeo.re on 

the "sett1IJ£I" lino. or line ou which tho koy lettors n.ro sot. AB l:'lodi:f;ted, 

) any one1:1y oryptn.11nlyat would not kno'~ '~1en tho ctog oontrol-lovor ralla into 

tl10 notch, unloaa he had an 1dont1oally n.rrunged set of alum!m.un. vihoela .. 

That provieion be rn..a.do !or tho insort.ton o! an easily rot1ovabla 

plato o.t the roat' o! the nnchlno, thi~ platt~ to bo so wlrod o.s to control 

1ihe oonuootiona ostnbUehed o.t thin point between ( 1) the koy-boo.:rd oontaota 

nnd tho con~uctor$ ultimo.tely leadiIJ.5 to tho contacts ot tho loft hand $1~0 

o! Wheol No. l, and (a} thQ light bLWlt oortto.ot~ a.nd the conduotors ultlmutoly landing to tho contaots o! 1;l;o right hand eida o:r 'ilheol No. 5, or vice 

vor~a, a.a tho oaee mn.y be. The inaertio:n of n now plato oompletely cha.ncoe 

the oom1oot1ons eata.bliehod at thia point. 

Pieoloaed on FebruB.111 23. 1924 to 

J.ivln c. VQr12', Lt. Col~, 6ig.COrpa .. 

cw.~.~~ 

Tl. F • FIU; .ll.tA,N, 

Criiptnnalystt Si.L'llll.l Corps. 

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