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REF ID:A67S39 

CR!PiocmAPBIC AID OPERAi'!IG ADVANTAGES 

The :p2'oposed machine contains the poaaib:ll:lt7 of controlllns 

AND 

the coding c7cle at w1ll11•k1:ns use of factorial 26 alphabets. 

'l'he punched card a •7 be prepared from &JV' source of information which ia available to parties with whom co11111111njcat1on :la desired. 

The7 •1' be aerial~ numbered and used over and over again. The1 •1 

be deatr07ed after use. Each card •l" be tumbled or turned end-forend to give tour different control patterns. The7 DllJ' be changed tor 

eve1'1 line of a • asase, or the7 •1 be lett in for &JV' de sired le;neth 

of ti•, depending of course on the degree of aecrec1 de aired. i!le tact 

that tba cards ma7 be punched from a:QJ source of information or from 

&J¥1 1BJ>8U&se or random selection, Jmlms it possible to have a •chine 

1n vhioh the rela7 selection :la never repetative, except poasib~ 'bJ' 

co1nc1dence, throughout the life of the •chine. 

There is nothing 1n the •chine itself which would be of &JV' 

aaaista:nce to 8Jl70D8 in aidi:ns the decoding of a message. Obviou.sl.7, 

'lmlaaa the proper card ia in place tor the line bei:as coded or decoded, 

and unless the plugboard connections correspond with those at the ti• 

the original 1118saase was put up, nothins reD11ina of &JJ1' value to &JJ1'-

one so far a a "breald.nB" a '1118 aaase 1 a concerned. 

It would therefore seem possible that the •ch:lnes could have 

v1de d1atr1but1on without the poaa1b1lit7 of their becomlns obsolete 

tor reasons of "1naecurit7". 

.. The card :movement is made eQual to the movement of the tnewriter carriage, b7 machan1call.y t1ei:ns the two together and there is 

therefore no poasibillt7 of the card and the letters beine typed getting 

i, 

@'pp roved for Release by NSA on 09-09-2013 pursuantto E .0. 1352a 
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- REF ID:A67533 

out of step. 1'his avoids the necass1t7 for reaett!.Ds •clmn1sm. or 

tor returnins to a g1'ftn point in the c;rcle tor the correction ot 

errors. 

To correct an error the carriages ma7 be back-spaced, the 

wrOJJB cJmractei-s enaad and the correct ones typed in. 
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• REF ID : A67 53~ 

The rela7s A to E and l to 5 i-ncluaiva are enarg1zad in combination b7 mane of holes punched in a card. This gl ve s a total of 

25 positions for each letter of the alphabet. If the 26th or English 

position is desired for coding purposes the rela7 X DllJ' be controlled 

from. another hole in the card. 

Z and the "equal" sign will decode as spaces. 'Die equal sign 

11117 be omitted entirel.1' if desired. 

The tJ'pevri ter keJ'board has been chansed to a modified 'l'eletypewriter arrangemnt. All alphabetic characters appear in one case 

and all mmrala and punctuation marks appear in the other. 'this mkes 

it possible to coda all letters, figures and punctuation which are 

fOUl'p in general telegraphic cQ1IDlllm~ cation throush one coding means. 

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Ona tJ'pical block of alphabets la shown to the left of the 

diagram. A total of factorial 26 are avail.able b7 pluging. 
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• REF ID : A67 533 4' 

De 8Cl'1Pt1on of Drawing .X-12,i! 

To the left of the diagram are seen the cam switches of the 

op~rat1ng t7P8wr1ter vh1ch close each time a character ia printed. 

These aw1tchea are plusvire connected to the transfer points of 1"9la7 

.X vh1ch throws the mch1nea into English position when the relay is 

energized. 

In the un-ener81zed position of rela7 .X the cam switch circuit is to one po1nt...each of rela7s A, .B, c, D and E representing one 

co-ordinate. Bela7s 1, 2, 3, If and 5 represent the other co-ord1mtte 

and when one rela7 of each co-o'l'dinate i8 enereized there i8 formed a 

circuit from. cam switch to solenoid. 'l'he solenoids operate the translatins tnevriter b7 levers, caus1ng a character to be printed. 

The combinational enarstzation of the tvo groups of relays 

allows a total of 25 different letters which ever;y other letter may 

equal, for anmple, the letter A ma7 equal ever7 other letter of the 

alphabet. A can onl7 be equal to A when rela7 X is energized, etc. 

A plugboard ha a been inserted between the solenoid poai tion 

leads from. the rela7a 1 to 5 inclua1ve, ao that &JV aoleno1c1 •7 be 

pluesed to •IV' ot the 26 positions shown. 'l'his ma7 likewise be done 

with tlla cam av1tchaa. Aa it 1a neoeaaary tbat cam switch A is plugged 

to oam switch poa1t1on 10 and solenoid A plussed to solenoid poa1t1on 

10, etc., dual plugs are used which plugs both circuits at tba aama t1ma 

am avoids the poaa1b111t7 of pluesine error. It also makes it possible 

to plug &IQ' of tlla factorial 26 alphabets aTailable b7 the plussins of 

but 26 wire a.