2,408,406 Patented vOct. 1, 1946 UNITED? * STATES orifice v ELECTRICAL ,_ .-.2408406 APPARATUS , o n _ .Hugoïfßenioii -La Canada, Qaliflfassigno?fby» mesne‘assignments, to SubmarineSignaLCom-JÁ, ‘ pany, Boston, Mass., a corporation-of Delaware ` original 'application April so, 194,1, serial ' NO_.I > 391,153,..l_ Divided and. this application October , 8, 1941, Serial No. 414,133 3 claims. `(c1. 25o-"arf A 1 , material transparent to waves _suchvî as Bakelite.'I T The present> application _is a division of my` copending applicationl Serial No. 391,153, >filed Apr11/ß_0.1941.- , - . ,. „ glass'or ceramic. -Mounted on the bas'e 1'1of the" ' casing'is av supporting bracket V8` containing the „ sparklovscillating device 9 of the general type'de-L ’ ’ scribed in my 'cope'nding' ’ application' Serial ' No. Theßltesent Mention. relates.„tol Short Wave transmitting> apparatus and particularlyto spark 362,434, med' october'l 23,' 1940. but 'differing in ' certainv respectsy willbe -described later-; " Two high-¿tension insulators "I3 and- II are’ The present inventionfurther relates to a mounted in the'b‘ase‘ 1 of the'c'hamberl and pro' method land apparatus> „for accurately controlling the _timemofy emission of , electromagnetic wave 10 vide ai support 'respectively for the- conductors" I2 transmissionof very high frequency electromag netic .Waves v_ _ . f , _ and '1_3 in 'series with'eac'h of whichïare resis trains.atAu1tra-highfrequencies in the range ap proiçi, vately of. ßgûmegacyclesand producing very shortßignalimpulses forthe purposes yof direc tive radiation with the use of a radiating horn' if flesiured.V .. ' . ~. - tors I4 and'IS and'thesparkg'aps ’I6 andv I1, re spect'ively.' and 2| tapering to center points.22 and -23 which The presentinvention further is concerned with the production and radiation o_frincreased power at theseîvery,highvfrequenciesand to this'end employs aspecial type of .high- frequency tank oscillator in which increased powermay be de Thev spark gaps"I3 and I1 are op-L. . posed to the terminals I8 and I9, respectively, 15 which,V in turn, connect to the 4metallíccones'20. are preferably ofsome, hard »metal suchas tung-V ` sten. The cones 20 and 2I,are supported by mica >insulating plates 24 and 25,.respe`ctively, which 20 are mounted at the ends of the element 23 which is cylindrical in its outer shape .with 'the interior veloped,y „Thisoscil1ator preferably contains in hollowed out to the shape of cones so that the " series a main spark gap and two auxiliary spark inner surfaces 21 and 28 are respectively spaced gaps although the\.auxiliary spark gaps may be away from the sides of the cones 20 and 2 I. eliminated in the operation of the system. The power is supplied to this series circuit through the 25 The element 26 at its end has flat sections 25 secondary of an air core transformer the pri mary of which is operated by a condenser dis and 30 against which the mica insulating sheets i 24 and 25 are held fast. In back of the casing 2 charge tube controlled or triggered periodically in a second chamber 3|, which need not be air «by means of a control tube, preferably a. thyra tron. The circuit formed by the discharging con tight, is mounted an air core transformer 32 whose - denser, the tube and transformer are arranged to 30 secondary 33 supplies power to the spark tank circuit and the primary 34 of which is connected through the concentric cable 35 to the power supply source which is more completely described in Fig. 6. In Fig. 6 the air core transformer 32 with the have sufficient resistance to provide a highly damped type of oscillation so that only vthe initial oscillation will operate the circuit. Further advantages and features of the present output secondary 33 and the input primary 34 invention will be understood from the speciñca _ may be operated and controlled through a circuit tion below taken in connection with the draw in which the thyratron tube 41 initiates the dis ings in which Fig. 1 shows a 'vertical section charge through one of the condensers C1, C2 or C3 through the apparatus; Fig. 2 shows a modified detail of an element shown in Fig. l; Fig. 3 shows 40 through the proper connection of the switch 44. The condensers C1, C2 and C3 are charged by the a section on the line 3-3 of Fig. 4; Fig. 4 shows direct current high potential source indicated at a top view of the detail shown in Fig. 2; Fig. 5 46 through one of the resistances R1 to R5 de shows a section on the line 5-5 of Fig. 1; and pending upon the position of the switch 45. The Fig. 6 shows a circuit diagram which may be used 45 condensers are discharged by means of the thyra in connection with any of the figures. tron tube 41 the grid of which is Ábiased by the In Fig. 1 there is provided an airtight chamber battery 48 in series with a triggering oscillating I within a casing 2 which may be made of metal , or conducting material with a valve 3 at one side source 49 which may be sinusoidal peaked or saw through which air or gas may be pumped under pressure. The top of the casing is covered by a toothed in shape and may periodically furnish a suñicient potential to the grid to initiate the dis charge of the condenser circuit between the cath plate 4 which hermetically seals the casing by means of the bolts 5, 5, etc., extending all the ode and anode of the thyratron tube 41, and thus control the time of spark discharge. When the thyratron 41 breaks down, the resistance R1 to the top and the clamping edge and composed of 55 R5 connected in circuit is substantially shorted, way around the periphery and clamping the cover to the easing with an airtight seal 6 in between 2,408,406 3 4 but the damping of the discharge is controlled by the adjustable resistance 43 to provide one major gaseous discharge tube having its anode con nected through said resistance to said powerl oscillation with only minor subsequent ones insuf iicient to cause a breakdown of the oscillator source on one side thereof and its cathode to said power source on the other side thereof and spark circuit. In the operation of the system shown in Fig. 1, the tank circuit is charged across from the spark point I5 to the spark point Il which, in turn, means for supplying a potential to said grid at predetermined times to operate said circuit. 2. An ultra-high frequency electromagnetic spark oscillating system, comprising, in combina tion, an electromagnetic spark oscillator, a charg breaks down with the breakdown of the sparking points 22 and 23, thus causing an oscillation of 10 ing circuit comprising a power source, an air core transformer having its secondary connected to electrical energy in the cones 20 and 2l and a radiation in the direction of the horn 50. In the modiñcation shown in Figs. 2, 3 and 4 an arrangement showing substantially half of the member 9 is illustrated. In this case the cen said spark oscillator, a condenser and a resistance all in series with each other, a grid controlled gaseous discharge tube having its anode connected 15 through said resistance to said power source on one side thereof and its cathode to said power source on the other side thereof and means for shell 52 by means of the mica disc 53 through supplying a potential to said grid at predeter the screws 54 holding the cone 5I to the mica mined times to operate said circuit and resistance and screws 55 holding the mica disc to the ex ternal cone 52. A uniform space 56 is provided 20 means connected in series with said transformer to control the damping in the operation of said between the elements 5| and 52. At the apex circuit. ~ , of the cone 5l there is attached a tungsten other tral conical element 5l is supported by the conical sparking point 5l which is opposed by the point 3. An ultra-high frequency electromagnetic tenna t2 which may be of such a vdimension as source on one side thereof and its cathode to said power source on the other side thereof and means for supplying a potential yto said spark oscillating system, comprising, in combina 53 adjustably positioned by means of the screw 5S on which the spark 55 is mounted. The screw 25 tion, an electromagnetic spark oscillator, a charg ing circuit comprising a power source, an air core 59 threads through the cylindrical end 6U of the transformer having its secondary connected to element 52 and permits an adjustment by means said spark oscillator, a condenser and a resistance of the screw 5S of the spark gap along the center all in series with each other, agrid controlled axis of the cone. A window El is provided so that the adjustment of the gap may be properly viewed. 30 gaseous discharge tube having its anode con nected through said resistance to said power . Mounted in the cone elementV 5I may be the an to provide the desired resonance in tuning of the system. This unit may be substituted for the unit 9 in Fig. 1. Having now described my invention, I claim: 1. An ultra-high frequency electromagnetic spark oscillating system, comprising, in combina tion, an electromagnetic spark oscillator, a charg~ ing circuit comprising a power source, an air core transformer having its secondary connected to said spark oscillator, a condenser and a resistor all in series with each other, a grid controlled grid at predetermined times to operate said circuit and resistance means connected in series with said transformer to control the damping of the discharge of said circuit by providing substan tially one major electrical oscillation for the oper ation of said spark oscillator with only subse quent vminor oscillations incapable of operating said spark oscillator. HUGO BENIOFF.