• REF ID : A67 433 • 

Pr1nt1D1 leohaal.. tor 11.161 

1. llnolving tne-n..i. - &e .& tJpe •..i ...... .,.. th• .... 

et • •haft driYen 1rr a oloclr-aprl.ne ttr electric llOter drift 1• nopped 

111 n• or 26 printing polit1ona, bt' MAn• ot -11 HlH'\or •aa•t• 0011-

trolled by oi:rCMlte cOlll.q fl'Olll the oiplMr wllNla. A l••er opel"atecl "1 

hand dell•ers th• power MH••l'J to 41'1n tb• .Print1D£ an apla•t. \he 

t7pe whHl, mne th• t,'pwrlttrr riltboa 1 and adnnoe the psper • 

.l!• In enaiph.erillg1 lh•n a ay • \Ile Jc97boar4 11 dep.re•Hd• a 

latch 1a released• al.lowla1 the type wheel to :reYOln on 9baf\J a olrcnai t 1• eatablllhed tbroaib the Cl'Jt'tognpb to oae of t.he a tine 11Utioaed 

aelaator mgnet11 t.he t7pe wb"l atopa at the •leclted cipller lettera 

th• llud left!' 1a opel'ated• prlating \Ake• plan, the paper 1• aclYueed 

and a cl)Jb1rr whMl is •tepped forward • 

.S.• In dee1pher1.ng1 operation ia ldent.1eal aoept tat Jlqboard 1• 

.VUok aacorciinr to cipllw letter• aad VP• llh.eel print• plala-\nt lett.ert. 

4, !he noord 1• •de on a paper tape, rea"1 to be eu-ed to a teleeraa blank fora, •• in 1tandard prR.e\1oe. 

J.• The cloelt-apriag ••'-' drlw, U ued, will ban to be W01llld flftr1 

ao often, depending on dH '4 .,..S..,1 l9a1tl& flf ••Ml•• and pow_. d•ll'NZ'ed. 

t· Allotber tn• or oatZ'Olled tJpe •h•l 1• • ..,111194 in the attached 

dn•iac, Ilg. 7. In t.hS.• tipn It. to !16 an eaaneoted to 16 nla11 b&Tl.q 

• comOJl return through l'el•H nlaJ D. Ila• tne wbM1 n 11 110Dted on a 

shati drlYa by c1ocJr,..aprha • 91MVlo •'-"• \braaah ... ton ot llUpp1atc 

olu\a1a. Th• abaft •l•o oani• a ........ an IA aad a1 the llrulb an ••P• .,._. 

a o1rcNlar rs.a, l ~ 26 eoataau • eiNalt l• elltahlilbed. through t.h• Pl'lat. 

•pet N whaan•r one ot the Nl&J• A,\ to '16 l• ~. The abaft 1• 

:nonall.7 Pl'"•tect troa Nt&U.C lip a jMleniit.loa ot the trua ara •'-''.lac 

agaian a lat.oh. controlled llJr Nl•• ..,..t M, will.eh 11 ooa\J'olled by rel••• nlq D, and th• la~te la ••ersl•• llr .., on• ol th• kq• or tile keJ'"-"• lb.en t.he prlat •&Mt 1• epante&t, 1 t at.rik•• th• tape qalan 

ibati J.nt.r • the t7pe wlleel ~ l• .....-w at tbet .,._,, due \o the 

rotaU.• ot th• t7pe whMl ...... •ft. be providld tor ateppln& th• \ape 

tonut. 

t. RorisoataU,-'a\11.po_. ..,. ••· - A• A 1•nc or Z6 JatapoMd, lade,.lldat '7P45 bar1 eJ.Ui• be._ u 11JP8r eel a lower poOftd -*• 

1a oonVall .. tv a tut ot 16 -21 ..iaotor aen•ta. Th• CNl'l'•t throgp the ..,..t la nttici•t \e tllro9 tile Vf9 lier •1ainat th• paper t.bl'ouP a 

tJPftl'l\er ribbon, •klni the t •••ill• oa the paper. The apeta work 

agaiu\ a ret.ftotUe •prlac t.e114l11c to withdraw th• '\7pe bar into non-print 

poelUon attw _.h operatloa. 

JA'pproved for Release by NSA on 09-10-2013 pursuant to E.O. 1352§ 

I}. f 
• ' REF ID : A67 433 ' 

.l?• !he tJP• rd neeJ'd ..- "1 'Uli• propeae4 ton l• i.Uutra'W 

1a tile at.teaed aaple, r11. 1, Th• letter• ue w be r•4 ._..,.. 

eoa•eoatlftlT, ud 1pe1l •t the 1entemea fll DfMR BRICl&DI Id 

llf 1111. 

&• Th• d.1aclYant&1•• 1.nhe:rent J.a thi• ton ot record alaould lie 

balaaae4 qaJ.nat \be achutqe that no IPl•IDI tn- wta..i, ao •ollaa1• 

toi: drlYiai the VP• wheel, and no spea1al relq9 are required. The ~p~a'\u1 1• therefore ailrpler., with tner _...., par't.1; and t.be apeed 

or open.\1on 1• cnat.er 11nce no tiafil de1af l• requlred tor orlen:t.lq • 

priatJ.91 *"l' 

Jl• The oalf •Ybc put• required la tble tJpe or reconlilll aealwai• 

(other th&n the 111~ bar•) are tho•• aomaeot.414 •1t.h adnnaiaa the paper 

and \he t7pewrlter r1~"9a. 

J. 11eotro-oheaioal •thod• - &• Ul1Jtl ._oal.q tr•te4 paper, 

elea.vle ftl'l'•t• troa 26 oondaactor• l••• ..na • the paper •h-'ftl" 

nneat 1• .P&••ed Vlrough tb• papc-. U ~ oeadanol'• tera1Dat• dtill 

1\99'-eabo..- le't•• 1D tM to:ra of VP" tana, tile aark.1 let\ • the 

ou.lealq HD81U.1ed papG' wUl oerre•posad 1u eatl.1.D• with let'Un ot 

th• alpllabet. !bu• the r•oerd will oonaltt ot letw1 •ITQI .. •• la 

the ... ot •tbod 2 •line, bat no ..... ,. an ncaa&red. the oaq •Yllc 

part• an tbo• a.au\94 w.l.th a4han•lnl the paper. 

~· '?he paper ••t. be •1n.o.4t ....... la erder that eleoV.lJ'el• 

oaa take plaoe aad W• 11 a mall ~-... It 1• not MCH8&1'J1 

•• I ~atMd lt, tba\ tlae pa,.r be aot•U,- wt, er •er•ed 1a nte. 

It need onl;r be molltttud, a• 'bf a wet roJ.J... 

1.. JlbotOfl'&plt.ie .. ~. - a. Thi• la a .-Uioation ot _..... I 

aboTe. Bori•oatalll' Juzt.apNed lllcilq ....,..._ aotaated bt a6 -u 

-...i. ...,. lltenoil• in the ,.t.h ot • ... er l.i.clR· The licbt palliltl 

t.hrftlb th• atneU 1• teou .. ed. tw a l•• on a llO'dq 1trip of 1eaa1tiae4 

paper -.,.. A lll\llid deftlopw 1• nqllired1 althcnap I uderltaad tllat a 

,. .. ntq inY•lded Mt.bod 4oel •t require COll6'l•t• 1-eraion o£ the ,.,_ tor daftlo~t ... tbini1 lMt oaq ao1ataiatt wltb water. It 1• po•dble 

tbat a w. ... pl'illt ,.,_ tape •thed aipt • worked oat tor •ah a pui)eM 

•• t.h11. 

Ottioe of Cbief Signal OttiHI', 

WalhillltMt ll. C., 

Octow 41 193'· - 2 -