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• REF ID:A67508. 

NoTember 22, 1935 

:ume>RANDUM TO: Kr. Rowe. 

l. On page 4, line 6, read "Figs. l - 7" instead ot "Figs. l·&n. 

2, On page 4, add after line 22: "Fig. 7 is a schematic diagram 

ot a modification ot the scheme sbovm in Fig, 6." 

3. On page 16, add the following: 

"A sixth embodiment ot this invention is shown in Fig. 7. In 

this form ot the invention use is made ot single ring commutatora which 

serYe both as substitution CODDRUtators and control coJllllutators in connection with a geng switch ot 26 contacts operated by a universal bar •• 

"Having now particular reference to Fig. 7, the elements shown 

therein are s im.ilar in construction and function with the corresponding 

elements shown in the preceding figure. In this embodiment of the invention, gang switch 85 is so constructed that when &111' ke7 is depressed, 

and universal bar 44 is actuated, switch levers 88, 188, 288, etc., disengage contacts 90, 190, 290, etc., respectiveJ.T, and engage contacts 

91, 191, 291, etc., respectivel.J. The operation of this f'orm of' the invention is as follows: When a message 1s to be enciphered, commutators 

l, 2, 3, 4, and 5 are aligned to a prearranged key and switch 36 is 

closed, setting up a circuit as follows: Battery 16 through switch 36, 

conductor 107, contact 90, contact lever 88, conductor 184 to contact 29 

of' end plate 301, through connutators 1, 2, 3 and 4 to commutator 5 which 

directs the current back through commutators 4, 3, 2 end 1 to contact 30a 

of end plate 301, through conductor 284 to contact leYBr 288, contact 290, 

conductor 106 to control magnet 13 and thence bnck to battery 16. When 

control magnet 13 is energized, commutator l is rotated through l/26th ot 

a revolution; setting up a new set of' circuits through the cipher wheels. 

The deY1ce is now read7 tor enaiphering the first letter of the 111Bssage. 

t ~· c~n- 1rJ_t this letter' 1s the letter A, the key corresponding to it is depressed, c~~tact er,: and the contact levers of' ge.ng-ewitcb 85 are caused to disengage 

contact : the lower set of' 26 contacts and engage the upper set of 26 contacts 

~~:a~c~~~ : settmg up a circuit as follows: From batte17 16 through conductor 23 to 

84 to •••••• i .contact 29, through and return through commutators 1 to 5 to contact 30, 

conductor 184, contact lever 188, contact 191, oonductor 93 to contact 

leYer 19, contact ~2, CORductor 121 to indicating device 14 which corresPond• to the latter ~' conductor 43, switch 36 to battery 16. Atter the 

letter Q, is noted, key A is Jmlli .... 4 released, ailowing the oontact levers 

ot gang switch 85 to disengage the upper set ot 25 contacts and engage the 

lower set ot 26 contacts. At the instant when contact levers 88 and 188 

v 
.. 

• REF ID:A6750Be 

both engage contacts 90 and 190 respectively, a circuit is set up 

as tollows: Battery 16 through switch 36, conductor 107, contact 90, contact lever 88, conductor 184 to contact 29 ot end plate 301, through 

commutators l, 2, 3 and 4 to COlllll\ltator 5 which directs the current 

back through c\ommutators 4, 3, 2 and l to contact 30 ot end plate 

301, through conductor 184 to contact lever 188, contact 190, conductor 

106 to control magnet 13 and thence back to battery 16. When control magnet 13 is again energized, cODD11utator 1 is again rotated through l/26th 

ot a revolution and again a new set ot circuits is set up 1n the coJlllllUtator 

units. The device is now readl' tor enciphering the second letter ot the 

message." 

4. On page 13, delete the first ten lines, and last three lines 

beginning with "lt key A". On page 14, delete the first eight lines. 

5. Figure 5 is to be changed as per sample. 

William F. Friedman. 

Attached. 

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