Letters Patent Is: 1. In a device for automatically conditioning a radio receiving set to receive radio waves from selected broadcasting stations, aWd receiving set havihg a plurality of semi-:ftxed tuning elements, switching mechanism to which slaid tuning elements are seleetably responsive a rotatable se lector drum having a plurality of equally spaced circumferentially disposed selector elements for selectably actuating said switching mechaniszn, means for lntermlttently rotaung add drum to bring each select,@r element to a stationm7 POsition at the same point and to retain &Ud drum in sWd stationary position for a predetermined Interval, means provided on each of said selertor elements Including a pluraty of cam surfaces 5 for co-operation with the actuating means for said s*itch mechanism whereby said selector elements may be set to bring about the desired op@eration of a predetermined part of said switching mechanism to bring in a predetermined broad- 10 casting station. 2. In combination with a radio receiving set having a plumlity of semi-fixed tuning elements switching mechanism to which said tilnin elements are selectably responsive, means for se- I r) lectably actuating said switching mechanism to successively select different impulses to be received, said las", mentioned means including an intermlttently rotating drum upon the periphery of which are provided a plurality of equally spaced selector elements each of said selector elements being provided with a plurality of cam surfaces arrglnged on the periphery thereof in offset relation to each other, each of said cam surfaces being arranged for co-operation with sead switching mecbanism to bring In a predeterrained broadcasting station, means for rototing Wd drum to bring each selector element to a stationary positlon and to retain the same In said posluon for a predeterniined tixne interval, and means for actuating each of said selector elements to bring the.desired cam surfaces thereof Into operative position with relation to the switching mechanism. 3. In combination with a radio receiving set, a plurality of tuning elements provided therefor, simple switching mechanism to which said tuning elements are responsive, means actuati.ng sWd switching mechanism, said last mentioned means including a rotatable drum, time controlled 40 means for intermittently rotating said drum, selector elements circumferentially disposed upon the periphery of said drum, said seleetpr elements being mounted for rotary movement relative to said drum, each of said selector elements being 45 provided with a plurality of cam surfaces armnged In offset rel.atiqn to each other, and means for actuating said selector elements to bring the desired esin surface thereon Into operative position, whereby said selector elements may be set 50 to bring about the desired operatiop. of a prei@a Imn to determlned part of said switching mc n bring in a predetermined broadcasting station. VVILLIAM RICE. 65 3UURICE H. GOLDBERG.

Patented:C@cL @0,, im 2vOl9tlS7 UNITE,D, S@TATE@S PATENT OFFICE AVTOlMnC Z"10 9;tA'nON SW.RCVOR IU" and Maurim ]ff. CoMberg, CMc"o, ML; xgd CioMbwg mwigmr to mgd Mm APPUMU= June 24, @1933, Serial No. 677,4i6 3 ClaiuiuL (CL 250--20) Thk invention relates gener&Uy to radio reodvft appwatue, and L more particularly to Leekctfte omtrol nnchanlsm:for the same. 7bue have been a number of propoaws, in the .AL Peak to mod& a niechanism for automaticaby Umft ra&o remivft circuits at tizned tnterV&W but Web mechwkiam Lhaiie not proved utidactory for vazlous reasons. 7be objections to devim of this type @in the ipast have been that Uw an readLUM@UM Vari&ble ra&o condenser for varyft the stations selected thereby, the mechanism d&viwd being merely some means for moving uld radio condenser to a predeterrained 5 PoJnt at a Prodetenwned time. Thl& ne@qa not only =de for a somewhat COMPlieMW and expen-sive mechanim, but also fAGOd to socurately tune In the selected station " anyone fanlmw with radio receiving apparatus know how imposable @it is to properi-v tune in a desired maio circuit by merely moving the candenm thereof to a predetermined fixed pWtim As a conwquence, none of these Prior deview Proved cammerewly practical. The pi lnvenuon is a distinct depprture from the Prior art proposak in that It @combines SIMPIO AQUA&ble tuning elements which may be set at xedetermined values with aimpie fOr MlOcti"IY tuuing in Predetermining broadC"tinff at&tio= L St Predetermined time Intervals 01 bY the Men movement of simple mechanism awh. for azample, as a simple switch or the like. It Is, therefore, one of the main objects of this in"nluon to L Provide an Improved mechanism which may be adectably set raanually, vp,hereby -5 &Utmatically vexioux stations may be tuned In and @the radio Instrument set into opemuon. Another object @ of this idvention Is to provide a machan#sm of the Wmve mentioned type havft umin nlegas wlwtawy responsive to simple awttdift mech-ism usoeisted therewith. A further ObJect of thb Invention is to @proVide & MOChanism of the above mentioned type in which simple @Wtching mechm2im are employed for seketably tuning in predetermined broadcagtft "tions and automatic tiine control Mm= for actuating aCd xwtching mech-itimn. A stM furtbar object of this Invention is to Provide a Plur&Uty of tuning elements for selectaNY Umbn in PredeteTained radio receiving eir@owts by the @movement of simple mechanism and Ume embvued me&= anociated therewith for a DWodic&W cbanging from one to the @other of Wd tuning elements, whereby different "tions may be periodicauy selected thereby. A -stih further ObJect of this Invention is to provide Ume controned me&= for cmftoleft the actuation of switching mechanism which an g a&smiated with radio tuning elements to bring the latter into service for sdectably tuning in predetermlned broadcaating st&Uons.... A stiu further% object Of this Invention is to provide in combination with a radio reoeiving,eir- 10; cuit including a plurality of tuning elementa which are selectably respondve to simple switching mechanism, time controlled me&= OPMI" to wlectably actuate Ndd switching mech%Linimn. whereby the recAsAving circuit win be tuned to 15 a Predetermined station,- and to periodic&W change the switching mechanism after a prodetermined Interval of time and to break the suPPIY of Power to the circuit at a predetermined time.@ so A a= further Wftt of this Invention Is to provide a mechanism of the character dowribed applicable to re&o receivers as at prewnt ammonly uwd. whereby the vamable condenser ot such radio mdve= may be readily Mrown ot# 25 of service and xupplemented by other tuning means sekctably responsive to simple xwtchi= mech&nim. which m8dM2iBm M&Y be wlwuvely an wt to function to automatwsny tune in various "tions at timed interval& 30 A aWl further object of this invention is to provide a device of the above menuoned chuacter which embOdieB nOt only nmnually and w lectively set meam for autonmticahy tuning a radio receiver to bring In v&Mousbroadcattin 35 stations at predetermined daired Umes, but which also automaticany stops or outg off frora OPerRtiOn the receiver suboequent to the completion of certain predetermined progr&=. the automatically stop mevm being &lw manueft 40 and selectively wt for igtich operLaM =id sutomatic tuning meam being independent of the, usual variable tuning elments at preaut emmonly used on radio recevers. A atib further object of this invenuon Is to provide a mechanism of the chamter dowribed which wfll be simple In coratruction, ameaggy and operation, which may be produced &long lines convenient for iow cest manufacture and which w:Ul be highly emcient for carrywg out the 50 purpom for which it ig des%Me& . with the fomoing and otber objects in view, whicIL win appear an the . dewxiption prooeedg, the invention consists In ceft@ novel fasuam of constrlmuon, arrmgamnt snd ombin&tiom 53

2 2,019,157 of parts hereinafter more fully dewalbed, Musbsted in the accompwwft dmwinp. and pilrticwariy pointed out in the appended cblms. it beft understood that various chmges in the form, proporuon, sin and minor details of the ftmeture may be made without departing from the spirit or sacriWM any of the advantages of the Invention. Plor the purpose of facflttating an understandio ing of our invention, we bave illustmted in the ammpanying drawinp a preferred nt tbereof, from sn inspecaon of whi& when emIsidered in cbnnection with the fonowing degcription, our invention, Its mode of constmetion. as15 wmbly md opemtion, and -- of its advantam aboillil be readily understood and appreciated. .efffring tD the dMWina in WbiehL the MM chilrecters of refemnce are employed to indicate 20 correspondam or gimil p&rU@ tbmughout the several nffures of the dmwints: PUure I is a front elevational view of a panel board with meebantom embodyins the present Invention supported thereby; 25 PU. 2 in a bottom plan view of the mechanism shown In PU. 1; PU. 3 is a botwm plan view of the adector dri=; PU. 4 is an enlarged fragmentary view of the so oppodte side of the dn= shown in Plg. 3 ' parts thereof being broken away to show the Inside consU=Uon thereof; PU. 5 is a view In eleviltion of me of the wlector elements. 35 pu. 6 is a ;iew taken on line " of PU. 5 showing the selector element in one of Its opmtive positions; PigL 7, 8, 9, 10, and 11 are viewx al-il to PU. 6, but showing the sdertor elemelnt In the 40 other of Its operative pogtions; Mg. 12 is an elevational view pwtly in owtion showing the --lial niews for actuating the wlector elements; and PU. 13 b a diagrammatic view of the electric circuit employed. Stated genemby, the Invention involves the provision of a plural" of aimple adjustable tuning elements, the values of which may be wt to bring in ; predetermined broadcastim stations, 50 Wd tuning, elements being capable of being brought into opemtion by the closing of a idmple switowng mecha,im. These gldjustable tuning elements am provided In addition to the variable @uning units as at present commonly used In 55 r&Mo receivers. For . . the purpow of automatically actuating mdd switching mechanism, there is provided a time controued meehanism, lncludinff a Pluranty of selector elements, each of which In adapted to 60 b.- mved to i& plurality of &djmted - .. mid positions being armnged so as to bring about either ojae of a plurality of desired opemtions. When in one position each of Wd wlector elements is capable of completely tnmlng off the 65 radio receiver, when in another position it wiU permit the tuning of the radio receiver by the woma tuming units, and when in its other position it wjU automatically close the switch mechanism to tune the rewiver to predetermined 70 broadcasting stations. RefmiM to the dmwings more qwcmc&lly by CbLracters of referenee, the number If designates a panel mounted. In a radio receiver upon which our improved mechilnism may be conventently supported. Thus an shown In ft. 1, mdd panel are a plurauty of simple carried by condensers II, 12, 13, and 14 wldch are adjustable the a es cOntrOlled by' witch 17, 11, 10, and 28,,resmtively., 'Me said switches may be of any suitable and weH known construction, and, a.5 Blustmted in the drawings, are carried In blocks 21 which are secured to the bracket 22, said bracket also supporting intermediate its ends suitable bus bars 23 which are connected in circuit with the condensers I I to 14. Thus the aiin- 11) ple movement of the switehing elbments 17 to 21 WIU close the circuit through predetermined seta of the adjustable condensers I I to 14. Suitable conductors 24 @connect the condensers I I to 14 with their co-operating switching elements 17 i5 to 20. 1 in order to actuate mad switching elementa ilnd abo &UTOMILUC&W at timed interVaIS the fonowing, improved mechanism is provided. Mounted on the panel 10 for rotary movement _oo thereon is a wlector drum, generally designated by the reference character 26, said drum being formed of a pair of iiisk 26 and 27 rigidly secured to each other In. spaced relatioi2 in ilny guitame manner. Adjacent the outer periphery %3 of the drum are mounted a plurality of selector elements 28, there being forty-eight of such elements equ&Uy spaced apart to perplit for the predetermined setting OfL the device for a complete L twenty-four hour period at half hour intervals. 3o Fach of the selector elements 28 is provided with a circular portion 29 adj&cent one end thereof wbich is received in a gruitable opening provided therefor in the disk 25 and a reduced circular portion 30 provided at its opposite L end for 33 reoeption in an op6ning provided therefor in the other diak 27. 'Mese portions 29 and 30 thus form suitable bearfts for the selector elements 28, whereby the same may be rotated relative to mdd drunl Intermediate the. portions 20 and 31 40 the selector elements ari@ of a hexagonal crow awtion as shown in the dmwings, and are provided with a plurality of transverse grooves 31, mid grooves being arrs=ed lh offset relation ilnd there being a total of dx of 'sWd grooves In each 4j of oWd selector elements. .7bus by rotating the wlector elements In a manner to be hereinafter more fury desc,ribed, the desired groove 31 of any selector element may be brought to any one of the six positions shown in Pligs. 6 to 11. so Each of the sele-etor elements is provided with iL amially shaped head 32 which is shown to be triangular, said head being adapted for reeeption In a similarly shaped socket for imparung the deidred rotary movement to the selector elements 5.5 In order to keep the said gelector elements In the dedred adjusted positions to which they may be moved, there Is provided a flat annular spring 33, shown in ft. 4, said spring normally pressing &panst the inner sideg of said elements for hold- iN ft the same in the positions to which they may have been moved. The resfliency of the spring $3, however, permits the reao tuming of said elements when actuated by the actuating member to be presenuy more fully described. Oa The adector dn= 25 Is mounted for rotary movement In a vertical plane, as shown in lMg. 1, and for that purpose It is disposed on a suitable sleeve 34 carried by the panel 10. interiwttent half bourl rotw7 movement is imparted tD the To wlector drum by means of a pawl 35 carried on the outer end of a lever 36, said lever being pivoted intermediate Its ends to the sleeve 34 and has Its opposite end disposed in position to be acuisted by a double acting cam 37 which b con- ti

.2,019,157 3 nmW with a mdtable clock mechanism 38 supported on the panel by meam of the bracket 38, mdd cam 37 being connected with the block nwohni- so " to malte one fuU revolution every hour. 7be clock 38 may be of any awtable confftructaon and may be either spring wound or electricaby driven. If an electric clock is used the ame may be of the weH known synchronous motor type and may be Included in the circuit, as - shown ip PU. 13, so that the ame may be In constant opemtion as long as the house current to which it is connected is uninterrupted. The pawl 35 is adapted to co-operilte with awtable ratchet teeth 40 provided on the disk 27 of the selector drum. A spring 41 normauy urses oWd pawl Into engagement with said ratchet teeth. If dedred, the ratchet, teeth 48 may be euminated and the pawl 35 arranged to operate with the projections 36 of the selector elements is, which projections, It wfll be noted, extend a substilntial dio"nee beyond the outer surface of the disk 27, as more clearly shown In Fig. 5 of the drawfts. As abtown In ]Mg. 1, one arm of the lever Sf Is dimposed in the path of movement of the cam 37 whge the other um thereof Is yieldably urged In a clockwise direction by mems of the cofl Wtmg 42. which spring will also be effective for hokling the lever In contact with the cam 37. PT= the above It showd be apparent that the cam 37. becwjse of its rotary movement Imparted to it by the clock $8, wiU actuate the lever 38 to move the same in a counter clockwise direction ag&UW the &cU= of the spring 42. When the lever has passed the highest Point 4on the cam 37, the spring 42 wiH move the lever and pawl to rotate the adector dnim 21 In a ckwkwise direction through an angle equal to the angle between any two ulector elements 26 or one-forty-eighth of a revolution. A stop menber 43 is provided for preventhm gmter . mommt than that of the wlmtor drum. The adector drum 25 wUl thus be advamed amdetermined dig"nee every half hour, tbjs movement beft anUrelY automatic and omtrolled bY the clock mechanism 38. As skeso explainecl each of the sweetor elements 28 is adapted for disposition In either one of siz PosiUons to which It MAY be moved. In order to move a desired Wector element to a position, we have provided the following improved mechanism. A lem 46 having a pointer 41 provided at one end Is pivotally nwmted Intermediate its ends on a &Wt 47, which sbatt is adapted to be received in the sleeve 34 for rot&Uou therein. On one face of the wlector drum are provided suit&We designat4= indicated bY the referenae chamter 48, Wd dedgmtions dedgnating the sweetor alemmts by numbers from I A. M. to 12 . &nd froML 1 P. M. to 12 midnight. The noon pointa 46 Ja so mounted as to oo-opersto with said utmdmn. whereby the disposition of the pointer opposite a designated time number win pft-Wt the wtting of the desired adector element to the desired position for that particular time Interval. ,rho end of the lever 45 disposed opposite that of the pointer In provided with an enlarged portion 49 in which is slidably mounted a aWt 60 to the bottom end of whieh is secured a socket 5 I for receiving the triangular shaped head $I of the selector elements 28. A awtable disk 92 in mmu-ed to the upper face of the enlarged portion 41 In any suitable r, such, for example, mame as by means of the serews 53. Dbposed above the disk 52 and in spaced relation thereto Is a hand.dial 54, said dial being rividly keyed to the upper end of the shaft 59 for imparting rotary movement thereto. A coil spring 95 is interposed between the disk 52 and dial 54, said spring surrounding said shaft and normauy holding the latter in its uppermost position, as shown in Fig. 12. A suitable shoulder 50 is provided on the shaft 50 intermedlste Its ends for limiting Its upward movement. A cut-out 57 is provided on the periphery of the dial 54 through which cut-out may be observed certain designations 52, provided on the disk 52 for facfli- IS tating In the settlng of the selector elements to the desired positions. As shown more clearly In lftg. 2, the normal poration of the awket $I wiU be out of engagement with the aelector dn= 45. However, when it is 20 desired to set the selector drum so as to bring in a certain broadcasting station at a predetermined time, the lever arm 45 ia moved to a position where the pointer 46 thereof wiU be disposed opposite the designated time. The shaft 50 may 23 then be deprewed to bring the socket 5 I into engaament with the head of the selector element dlaposed directly below it. 7%e hand dial 94 may then be rotated to bring the solid selector element to the desired position, 30 said poemon being indicated by the markings or designations on the disk 5.1. As there are only six @oduons to which any selector element may be movw, the merkings on the disk 52 wiD. therefore. be from I to 6. By thus observini the nulrk- 33 ings of the disk 52 through the cut-out 57 of the hand dima. the particular selector element being votuated may be merved to the desired positieu u noted by the indication on the disk 62. @l In order to lock the drum 25 againfft move- to ment when the selector elements are being set by the hand dial $4, there Is provided a suitable braking jawa&nismwhich, In the'embodiment illustrated, compriew a lever 98 pivoted at one end to the panel 11, 'm shown at 51. and having its opposite end dtoposed in posit4on to engage the selector drum if when moved to such position by an arm 69, whith arm is disposed against the underside of the Imr 58 and Is adapted when moved ilbout its pivot II to urge said lever 58 against the 60 drum, and when moved in the opposite ilirection to permit the lever N to move out of engagement with said drum. A:dat spring 62 having one end therwf secured to the panel II is provided for eooperatiug with the arm 60 for holding the latter 55 in eittkpr of two adjusted positions. A stop member IS may be provided for limiting the movement of the arm 68 in one direction. As hereinbofore mentioned the selector elements am employed for actuating the switching 00 elementis 17 to 21 at predptermined time intervau to bring about the desi.red operation of the device during that time interval. Those disposed directly below the selector drum 25 are a plurality of levers 65, 64, 87, 68, $9, and 70, said levers 45 being pivoted Intermediate their ends on a stud 7 1, wkdch stud Is secured to the panel I 0 &3 shown at 72 In Fig. 1. The Wd levers 65 to 74 are mounted so that their longest and heavier ends are on the right of their pivot 7 1, as viewed In PU. TO 1, whereby they wM b,Y their own weight be urged in a clockwise direction at SU times. EiLch of the levers 66 to 60 is provided &dj&mnt the end disposed opposite the drum 25 with a projecting portion 73, which portion Is a"Pted to be ff g 10

4 rwdved in the groove 31 of the mlectcr element digpoged directly above it when said element is in @& pogition where one of the grooves 31 thereof is in sugnment with the edge of the lever, as shown a in fuu Una in PU. 6 of the drawings. The rear portions of the levers 15 to 70 are arranged In the proper spaced positions with their projecting ,=dons 73 disposed agaimt the lowermost uleetor element in the drum 25. When in that posiio tion it will be readily appwent that one of aWd ieven win have its projection 73 dwpoaed In the gmve 31 of sCd lowermogt selector element. The opposite ends of the Imi 69 to 69 are din-, posed in pogtion agaimt the Wtehing elements 13 17 to 21 and are provided with upstanding toes 74, which toes are aftpted to enme their cooperating Wtching elements for moving the same out of contacting engagement with the bus bwa 23. 20 The lem 78 Is provided &dj&cent one end with .& damding pvuon IS, which portion is aftpted to mgap the nwv&We contact 76 of a switch I$.-17, the other contact 77 of which is ftxed. The switch 76-77 is in the -&in line connecung 26 the 110 volt house current with the raffio receiver. The oontact 11 is so arranged that when the depending portion 76 is In a down position, that is, when its portion 13 is out of engagement with the groove 31 of the selee6r element dis30 posed dimtly above it, the circuit to the radio receiver wtU be closed and the receiver capable of operation. However, wban the projection 73 of the lever 71 is disposed In the groove 31 of the selector element directly above it, it will permit 35 the opening of the switch 15--77, thus cutting off the power to the radio receiver and shutting off the same. The lever 70, therefore, is employed for t,he pur .pose of maintaining the circuit to the receiver closed when the adector element direc tly 4o above it is in any one of its five positions of the mx positions to which It may be moved and to break, mad circuit when mdd sdector element is In its last of I I ts mdd six positions. One of the other levers 65 to 89, my, for ex4a ample, the lever $9, Is armnged so that when its projecting portion 73 is in the groove 3 I of the selector element and directly above it, ft wiU perriat the actuation of a switch element 78, to cut in the usual tuning elements 79 and 80, whereby So the mdio receiver may be tuned iii the ordinary nulnner. Vihen in this pozition it wffl be apparent that the other switches 17 to 29 will be open bT reason of their engagement by their reswtive levers It to 68, thus cutting out from the circuit the simple adjustable condensm I I to 14, thereby permitting the ordinary operation of the receiver for tuning the same in the usual manner to bring in desired broadcasting stations by actuating the. variable condensers 70 and 89. 60 It wW Om be noted that at this time the switch 78--77 wfll be In a closed position, thereby closing the circuit to the mdio receiver. When one of the other levers 05 to 41 are disposed in a poduon with the projection 73 thereof 65. disposed in the groove SI of the select.or element direcuy above it, one of the switch elements 17 to 21, which is disposed opponite the toe 14 of that particular lever, will be permitted to make contact with the bus bars 23, thus completing the TO cimuit through the respeetive adjustable condensers I I to, 14, thereby bringing in a particular station to which the particular condenser has been. previously tuned. Plrom the above it wfll be readfly apparent that is each of the adector elements may be set In one of dx postuons for co-opamting with; one of the leven Of to 16 for brin" abottt a- desired operaum of @ the reao receiver. @ ',Thua ' wbft in one POsitim it wiU Permit the swwging of the lever 79 to brftg about.the opening of the switch 16--77 for conwietely shutting off the radio reoeiver. , When in another position it wW permit the swinow of the lever 69 to permit the actuation of the switch 78 for cutting out the condensers II to 14 and for cutung in the variable con- 11 dennn 71 and 84 for pdrmitting the umma operation of the nulio receiver. When in one of the remaining four pogtions @the selector -element will cooperate with:one of the remawft leveris to permit the cloaft of the circuit automatie&W l@ through one of the condensers I 1. to - 14. thus brW" in it PwUcular broadcasung station for which the P&rUcular condenser has been pre-. viously set. In the use of our Invention the.simple adjust- a able condensers I I to 14 -are set In the desired positions to correwmd to the "Uon that the particular condenser is to tune In, that is to say, the condenow I I mity be set to tune In stauon WBBM, the condenser 12 to tune in strtion i WON, the 13 to tune in statiozi KYW and the condenser 14 to tune in station WMAQ. Although four guch &djustable.condensers an illustrated in the drawings, it Is under3tood that a lesser or greater number of said @ stmple ad- a justable condensers may be employed with equal-. ly satlafactory results. Thus the selector ele-ents may be octagon in cross section, thereby permitting fts disposition in eight instead of six different positions, in which case a plurality of 8 six semi-flxed condensers may be employed for bringing in automatically aix broadcasung stations by the mere clow= of simple switching mechanism The condenam, I I to 14 may be of any tYPe 4 awtable for tkda purpose, and in the preferred embodiment, then UuW be of wbat is known as the seml-fted tym aM we chamcterized by the fact that the value of, the condenser may be ad-: Juded in a very simple manner, such. for ex- 4 SmP]e, Ls by the gdmple manipulation of a screw or the Uke. The operation, of the device. should be roadily appannt from the above without further dewriWOn. An already stated, the purpose of the a devioe Is to man%, IIY set the same for a complete twenty-four hour period and then to permit It to automatic&Uy operate the receiver either, to tune in cer I tain.deeired broaftasting stations or to shut off the reeelver or to place the receiver a In eondition to Pemilt Its ordinut operation, all Of this being accomplished without @further attention untfl the order is to be changed. As an example of the operation of the device, swuming the pointer 41 to be in.the position 0 shown In Ing. 1,, in which position It wfll be@ noted it is disposed QPPosite the selector element between the times gLs Indicated on the drum 12 noon and I P. M. or 12:30 P. M. With the pointer in this posiuon the actuation of the hand dial 54 to move the wlector element disposed directly below it wiU set this selector element to the desired position for the half ho.ur interval with 12:30 P. M. The position to which the par- 7 ticular. selector element is to be moved may be observed on the disk 52 by. noting the numbers 521 thereon. 7bus as ahown in PU. 1, the designation on the disk $2, visible through the cut-out in the hand di Is the 1, WhiCbL@nUMber. I

2,019,157 may correspond to.the'position of the selector elenient shown in full lines In PU. 6. Now amuming that when in that position the groove 31 of said selector element which will be exposed for reception therein of the projection 73 of the lever 65, wlilch lever will then be permitted to swing about its pivot for releasing the switch element 11 to close a circuit to the semifixed condenser I I for bri@ing in broadcasting station MMBM. When, therefore, the time of 12:30 P. M. has arrived the particular selector element will be disposed at the lowermost point of the selector drum and win be in the position to permit the swinging of the lever 66 about Its pivot to bring about ' the closing of a circuit through the condenser I I and at that time station WBBM win be heard from. This particular station will be tuned in for the entire half hour period at the end of which a further rotary movement will be made by the selector drum bringing Into opemtive pogtion the next successive selector element whicli will be effective for permitting the swinging of one of the levers 66 to 70 to bring about the desired operation of the receiver for the next hajf hour period. Particular attention is directed to the fact that the device is capable of not only tuning In automatically desired broadcasting stations, but also of completely shutting off the receiver at predetermined tixnes and for predetermined periods of time. F'rom the foregoing It will readily be seen that the present Invention provides a novel and improved stmeture which may readily accomplish the various objects for which It has been designed.. It will be understood that the invention i.s not confted to the specific structural details herein shown and described, and that numerous changes and modifications and the further use of equivalents of the present Invention may be resorted to without departing from the spirit or scope of the invention as outlined In the appended claims. Having now described our Invention In the molnner in wlilch the sam operates, whilt we claim ilnd desire to sfture by