REF ID:A39186 

Aprll 21, 1936 

laSMreh tc Df.vel.01-'DDt D1vi1ioa. 

(Tlrl\111 ~ar r'l&na k !1"!111!.:Qf Dlv.1.e1oD) 

1. There ls attachea hent.o a ak11t.ch and desorlptloa 

ot a.a 1r.iil•tinr d.Ylae 1n•ented 'II' .. ori larch. ~o. 1936. 

Tbls dn'ic• la no~ "' C17pto;ra,>bic 4fv1ce lu.t it. ll20' bt.I 111ed 

as a kl~gr:~;?l:. devlce, aither r1100n.il.aa 01" nam-ecordiag. It. 

la c:ledncl to pateat t.ld.a lrrn11Uon. 

2. Illtol"IUltlon i• re :ue•ted u to wbeth~r I 19¥ obtaln 

a ~int on this deY1oe tbroacb tho Patunt S•aU~n o£ tbla 

ottlce. 

Attaabed1 

&etch and deecrl}tloa. 

COP! FOR MR. FRI:WMAN 

lA\pproved for Release by NSA on 10-17-2013 pursuant to E.O. 1352§ 
REF ID:A39186 

• • 

llareh 20, 1936 

Incli•t:l:ag Dnic• 

l. !be dedce to be d••riDed may be ued fer aewral p'IU'poaea, of 

which the tellowing are 01"1oaa1 

ll• lbr :lntercoDDecU.ng. tw ettloea at a l•c•l headq•rien, ao that 

a keybea:rd operated at a calling etation will indicate wo:rda, 

letters, numbers, or aca'b:lnationa thereof at the •llad station. 

l· ror adwrtia:lng purpoaea' u a dedce tor attracting attention 

by a palling out :1n letters and tlpra1 the aclTariisment. 

a. '!he device is disclosed in the aoocmpmJing l'ig. l. The meohanism 

there 1han ia adapted to indicate the 26 lR,~en of the alphabet and the 

digits 2, 3, 4, s, 61 'l 1 and a. ('the letter 91• oan eerw tor the digit 

-i.•1 the letter •o• tor the digit •o ... ) But, tor adnrt:laing purpoaea, 

additional c-:baractera may lte •ployed, or even voupings ot c:bara.ctera in 

the form. ot words, pictures, etc. Bow th11 ia possible will 'beooma apparent 

f"rom a cODBideration of the ayat•• 

s. In ftg. 1, a tatal ot 34 ebaraatera is to be rapreaentecl. .A. keyboard 

tor setting u.p permutat:l.OllB in aac:ordanc:e with a 8-md.t code :la prodded. Let 

the plural urp.t ahazoacrter code be u tollon1 
+··+ +-+ + + 2 

+++++-K 

++++-+Q 

++++-- u 

+++-++3 

+++-+- J 

+++--+• 

+++---A 

++-+++ x 

++-++-r 

++-+-+ y 

++-+-- s 

• 

REF ID:A39186 .. ~ 

-++--++ B 

++--+- D 

+·+----+ z 

++---- J: 

+-++++ v 

+-+++- c 

+-++-+ p 

+-++--I 

+-+-++ G 

+-+-.+-a 

+-+--+ L 

+-+--- 4 

+---1-++ )( 

+--+-f-- N 

+~-+-+ R 

+~-+-- 5 

+---++ 0 

+---+- 6 

+----+! 

+----- 7 

-+++++ 8 

-++++- 9 

(The penmtations assigned to the letters of the alphabet correspond in the:l:r 

2nd, 3rd, 4th, 5th, and 6th elements with the Baudot 5-unit code.) The 6 permutation pairs or the keyboard control the 6 contacrt level'.'& shown at. 1 ot Fig. 1. 

They eaeh have 2 ccntacts. At 2 there .is shO'inl a homologous set or 6 contact 

leTers and associated pairs Of mntacts. These contact levers are controlled 

by pins which proj act tram the periphery or an indicator wheel a. Means are 

proYided to keep the indicator wheel in ccmstant ro'f;ation. The periphery or the 

indicator wheel has a translucent or transparent window running all around. it 

azid. this window is d.iYid.ed up into 34 equal segments on &a.ch or which is painted 

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REF ID:A39186 

one ot the 34 characters. For visual indications a lamp 6 is placed within the 

interior of the indicator wheel and close to the surface nearest the point 

ot obaenation. It will be rioted that this lamp will be illuminated only 

•hen the 2 sets ot contact levers at l and 2 are in homologous positions 

with respect to their associated left and right contacts. As the keys corresponding to the successive characters to be indicated are depressed at 

the keyboard. ot the calling station, they are illuminated successively at 

the called station. Another method ot operation would be to cause the compa.rison circuit to stop the indie-at or wheel in its rotation trom a starting 

position, at the selected position determined at the keyboard. 

The same basic mechanism may be employed tor making a printed record. 

Instead ot a transparent or translucent window in the periphery of the indicator whee-1 let this be replaced by a band containing embossed characters. 

Instead ot the lamp let the comparison circuit actuate a magnet which causes 

a pa.per tape to be thrust against the type band at the instant the comparison· 

circuit is completed and at the same time let the tape be advanced. 

In the toregoing system there are 34 characters but with a 6-unit code 

it is possible to pr.ovide tor the indication or recording ot a total of 64 

characters. 

For connecting the calling station with the called station a 12-conductor 

cable will obviously be required. Since this system is intended tor inter-

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REF ID:A39186 

---·--·-·· -·· ·------------------· 

~.-a•· ·Of" a rota.ting dl"mlta:11pen ·whicl· p1aa .. cnm be• Ht ap to correspond to 

tke aucoeea&ff. eftarac-t·ere· to· 'be, intic....._ filly· t-he Ilise· et the dram 1'111 

new data ceu!d'· IJe .. •.-. . ..,"' M·· &11 en- tile· dnm. 
REF ID:A39186 

April 21, 1936 

Addendum to Invention of Indicating Device. 

1. The qstem described above can be used tor telegraphic 

purposes by' more or less simple extension of the principles described, 

as noted below. 

2. Suppose that the local and distant stations are provided 

with identical rotating wheels 8)'1lchronized bJ' start-atop impulse, 

so that the rotating drmu start s1aul.taneou817 and •ke their rev-· 

olutions at practicalJ.T the same rate o£ speed. 

3. Let the comparison circuit then actuate a line or signal 

transmitter relq at the same instant that it shows or records a 

local signal. ·Then at the distant station, when the signal arrives 

it will cause the same indication or record to be made, since the 

two drmas are in SJ"DChronous operation. .At the called station, 

according to this method ot operation, the comparison circuit is 

not in operation for receiving purposesJ the comparison circuit is 

in operation tor tranSlllitting purposes onq, and either station can 

operate in this respect, alternatel,y. 

William F. Friedman. 

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