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• REF ID:A67720 e 

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IN TEE 0!'1ITA:D ~'T • .T:!:S p ~mrr OFFICE 

In re applipation of 

~'m. F. Friedman and 

Frank B. Rowlett, 

Serial No. 36,868, 

Filed Aug. 19, 1935, 

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System for RandoAizl.D.g the Relations 

of Electri-cal Circuits.· 

Hon. 'Commissioner of Patents, 

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Div. 48, RooA 5731 

June 11., 193 6. 

Suppl8l'lental to E!l'.endm.ent dated l:ay 22, 1936, it is desired 

to incorpor.at~ Bdditional clnlllS as follows: 

18. A mecllanism of the ohnracter described comprising a set 

of switching devices provided with movable cr>ntacts for establishing 

J.ntermitten1; circuit connections; and means. includmg slipping fri<'tion 

drive elements for varying the rate of AOVeElent ot said devices in respect 

to the ti~ interval between the successive operations of any given circuit. 

19. A SY1itch1.ng device comprising components provided with 

electrical contacts, said can.ponents being lllOvably associated for establishiug intermittent circuit connections; and .means ror V8.I'Y'ing the,relative 

rate of movement or said components independently and dif~erentinlly to 

change the tllllS interval bet1•een circuLt controlling ,operations of ony given 

circuit. 

lA\pproved for Release by NSA on 09-06-2013 pursuant to E. 0. 1352§ 
• REF ID:A67720 e 

20. A switching mechanism cam.prising relatively movable 

compon&nts, ,provided with electrical contacts for establishing intermittent 

circuit connections; means for varying said connections, including differential 

sl~p-disk driving systems operable with each of said components for randomizing 

the intervals of time between succeseive operations of any given circuit. 

21. J,, switching mechanism comprising relatively movable components, 

' provided with operatively associated contact elements, one of said components 

having its elements a-rranged 1n any order; and means tor moving said co~ponents 

relative to each other whereby the time interval between the opening and closing 

operation of any given circuit is varied aperiodically. 

22.. A switching JllBChanism comprising rotatable components, each 

provided with operatively related contact elements, and one of said components 

having its contact elem.e~ts elect~icaily connected in a fortuitous order; and 

means for varying the relative rate of movement of said components for inter .. 

mittently nnd aperiodically ettect:ing the operation of any given circuit. 

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23. In a mechanism of the cha1"B.cter described, complel!l.ental 

slfitchiJl6 devices each provided wi'th electrical contacts, one of said devices 

having its contacts spaced at irregular intervals 11ith respect to each other 

and electrically interrelated for establishing a plurality o~ circuit connections; 

and means for independently and diff.erentially operating said devices whereby 

the contacts are caused to effect circuit connections at varying time intervals. 

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• REF ID:A67720 • 

An important object of this inv~ntion is to provid~ a moans 

of selecting from a plurality of available electrical circuits a sinsle 

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circuit at random, which will be operative tor a perigd of time, the 

length of the interval depending upon the variable factors such as intraduced by the mecheniSll.l of the present invention. The clai~ presented 

at this time have been drafted with a view to ~efining this concept an4 

are submitted to the end that they may be considered by tl1e Elll:emllner at 

' the time this case is taken up for reconsideration in connection with the 

recent runendment. 

Respectfully submitted~ 

Wm. F. FriedmRD. end 

Frank B. Rowlett 

By: 

Attorneys• 

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