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Aug. 16, 1949. H. E. EDGERTON 2,478,908 ELECTRIC LIGHT-FLASH-PRODUCING SYSTEM Filed Feb

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Aug. 16, 1949. H. E. EDGERTON 2,478,908 ELECTRIC LIGHT-FLASH-PRODUCING SYSTEM Filed Feb Aug. 16, 1949. H. E. EDGERTON 2,478,908 ELECTRIC LIGHT-FLASH-PRODUCING SYSTEM Filed Feb. 11, 1946 3 Sheets-Sheet li Aug. 16, 1949. H. E. EDGERTON 2,478,908 ELECTRIC LIGHT-FLASH-PRODUCING SYSTEM Filed Feb. ll, l946 3. Sheets-Sheet 2 HAROLD E. E. DGERTON INVENTOR. Aug. 16, 1949. H. E. EDGERTON 2,478,908 ELECTRIC LIGHT-FLASH-PRODUCING SYSTEM Filed Feb. ll, 1946 3. Sheets-Sheet 3 ? : HAROLD E. EDGERTON. INVENTOR. Patented Aug. 16, 1949 2.478,908 UNITED STATES PATENT OFFICE . 2,478,90s ELECTRIC LIGHT-FILAS -PRODUCING SYSTEM Harold E. Edgerton, Belmont, Maas. - Application February 11, 1946, serial No. 646,781. 5 Claims. (CL177-329). 1. The present invention relates to electric sys tion: Fig. 2 is a fragmentary perspective, with tems, and more particularly to flash-producers. parts broken away; Fig. 3 is a view of one of the From a more specific aspect, the invention relates flash-lamps, the reflector in which it is mounted to flash-producing beacons, such as are used at being shown in longitudinal. section; Fig. 4 is a airfields to signal or otherwise attract the atten diagrammatic view of circuits and apparatus em tion of aviators in airplanes. The invention is bodying the invention, in preferred form; and in the nature of an improvement upon the system Fig. 5 is a similar view of a modification. disclosed in a copending application, Serial No. According to the specific embodiments of the 510,984, filed November 19, 1943, now Patent No. invention that are herein illustrated and de 2,449,063, of September 14, 1948. 0. scribed, a number of flash-lamps 8 are spaced In the said application, there is disclosed a uniformly over the beacon throughout the 360 beacon employing a number of flash-lamps, ar degrees of azimuth. The invention is applicable ranged according to a predetermined configura to other configurations also. In the illustrated tion, and illuminated rapidly, in predetermined configuration, however, the flash-lamps 8 are Sequence or succession, by discharging a high 5 disposed along a circular row in a horizontal tension condenser through them rapidly in pre plane, within a housing having a cylindrical trans determined sequence or succession. As all the parent wall f, at the top of a beacon support 8. energy of the discharge condenser is thus ex Each flash-lamp is mounted in a reflector 25 for pended, at any particular time, in producing a directing the light of that particular flash-lamp flash, high-intensity flashes are thus produced 20 along a particular direction of azimuth. The for very short periods of time. The energy of flash from the lamp positioned at A, for example, the condenser is replenished by recharging it may be directed South, in which event the flash before each discharge thereof. The number of from the lamp positioned diametrically opposite, flash-lamps is sufficiently large and the flashing at B, may be directed north. The flashes from is sufficiently rapid to give the illusion of a beam 25 the lamps positioned at C and D may similarly of light traveling rapidly from flash-lamp to flash be directed east and west, respectively. Two lamp following the predetermined configuration. flash-lamps positioned at E and F, on opposite There are cases, however, where it is not de sides of, and adjacent to, the flash-lamp posi sirable to be compelled to discharge the same tioned at A, will direct flashes in corresponding high-tension condenser through all the flash 30 directions: the lamp positioned at E will direct lamps, even though this is effected in predeter a flash between south and south-east, and the mined sequence: or succession, and not simulta lamp positioned at F will direct its flash between neously. - south and south-west. The lamp positioned at . According to the present invention, the limita G will produce a flash in a direction between east tions mentioned are overcome by arranging for and south-east, and the lamp positioned at H in the discharge of a separate condenser through a direction between west and south-west. The each separate flash-lamp. Although the use of lamps positioned at J, K, L, and M will send their separate condensers on individual lamps will in flashes in directions opposite to the directions of volve more apparatus, the following advantages flash of the lamps positioned at G, E, F and H, are attained: 40 respectively. As many lamps as desired may be First, the entire beacon will not be extinguished provided, each with a reflector for directing the flash in a particular direction of azimuth. It is in case of the failure of one of the flash con convenient to employ also a further flash-lamp, densers.Second, the use of separate discharge Con shown positioned at I, for directing its flash up densers allows more time for the charging cycle. 45 ward through a transparent portion 32 of the . This may be important when it is desired to oper upper wall 33 of the housing at the top of the ate the beacon at a high flashing speed. support 8. This lamp is particularly useful in Furthermore, efficient flash tubes require time foggy weather. for deionization, and this is provided in a charg Each flash-lamp 8 is of the gaseous-discharge ing circuit that builds up the condenser voltage 50 type. The flashes through the separate flash at the minimum rate. - lamps 8 are produced by discharging there The invention will now be more particularly through the electric energy stored in separate explained in connection with the accompanying high-tension dielectric electric-energy-storage drawings, in which Fig. 1 is a diagrammatic ele means or flash condensers, several of which flash vation of a beacon embodying the present inven 55 condensers are shown at , f and 2. The 2,478,908 3 n 4. number of separate flash-lamps 8 is equal to The flash-lamp 8 is shown provided with a the number of separate flash condensers. Each cathode 7 and an anode 9, respectively connected separate condenser corresponds to one and one to the terminals 6 and 2. A high-voltage-spark only of the separate flash-lamps, and each sepa trigger or trip wire control starting electrode 22 rate flash-lamp corresponds to one and One only is connected to the terminal f. of the separate condensers. The condensers con The voltage to which the condensers , , - - - stitute the principal sources of energy for effect 2 are subjected by the direct-current voltage ing the discharge of their corresponding flash Supply before each discharge thereof is insufi lamps 8; they are first charged and then dis cient to cause these condensers to discharge be charged through their corresponding flash-lamps O tween the cathodes 7 and the anodes 9 through 8 rapidly, in predetermined sequence or succes the normally non-conductive flash-lamps 8, sion. Surges of current are thus caused to flow when non-conductive, notwithstanding the con rapidly, in predetermined sequence or succession, nection of the condensers to the flash-lamps 8. through the flash-lamps 8. Each Surge of cur The flash-lamps 8 are rendered conductive, how rent produces a flash of high intensity in the ever, to control these discharges under the control corresponding flash-lamp 8, followed by prompt of the starting electrodes 22. The starting elec extinguishment of that lamp 8 and the fashing trodes 22, in turn, may be energized in any desired of the next flash-lamp f8, in predetermined se manner, as by. means of normally ineffective quence or succession. Each flash-lamp 8 is thus trigger-discharge circuits operable, when effec rendered momentarily luminescent, to produce a tive, to render the flash-lamps 8 conductive irre flash, by the discharge of its corresponding con Spective of the state of charge of the condensers. denser therethrough. This will now be explained. - . Assuming, for example, that the flash-lamp In Order that it may discharge through its cor positioned at C is the first to flash, the next lamp responding flash-lamp 8 when conductive, and to flash will be that positioned at G, then the through no other flash-lamp 8, each discharge lamp positioned at E, then the lamps positioned condenser is connected to its corresponding flash at A, F, H, D, J, K, B, L, and M. The lamp posi lamp 8 and its corresponding flash-lamp 8 only. tioned at I will finally be flashed, after which the To the attainment of this end, the cathode 7 and other lamps will be again flashed in succession, the anode 9 of each flash-lamp 8 are connected in the same Order. through the medium of its terminal pins 6 and 2 Let it be assumed that the incoming aviator is across its corresponding discharge condenser and directly south of the beacon, and at a consider to no other discharge condenser. The terminal able distance therefrom. He may, in that event, pins 2 are connected to a grounded terminal 15, observe at least the flash from the lamp positioned at one side of the respective storage condensers at A. That single flash alone will guide him to , , - - - 2, by respective conductors 3, the airport. By reason of the fact that the whole 3f, - - - 23, through charging resistors 35, energy of the particular condenser is concen 35, - - - 235, and the terminal pins 6 are con trated, at the time of the flash, in that one lamp, nected to a terminal 3, at the other side of the the flash will be of considerable intensity, with condensers, by a common conductor 29.
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