1319436 Simulator apparatus IMPULSPHYSIK GmbH 4 Nov 1971 [24 Nov 1970] 51244/71 Heading F3C [Also in Division H2] A simulator apparatus for electric pulse radiation and light propagation of nuclear weapon explosions has an aerial circuit comprising an inductance 12, a storage capacitor 13 in parallel with a spark gap 15, the latter being connected through a switch 16 to a high voltage source 63, a first flash apparatus 3 which is fed by the capacitor discharge, and a first electronic delay element 2 which is triggered by the operation of the spark gap 15 for the delayed triggering of the flash apparatus 3. A second flash apparatus 5 is provided and is fed by capacitor discharge. The apparatus also has a second delay element 4 which is triggered by the operation of the first flash apparatus 3 for the delayed triggering of the second flash apparatus 5. The electromagnetic pulse is supplied from a rod aerial 11, connected to the inductance 12, and capacitor 13, the whole being connected to a case 7 which receives the simulator apparatus. The rod aerial 11 radiates a voltage vector when the switch 16 is olosed and, when the spark gap 15 becomes operative, the delay element 2, connected in series therewith, is started so that, after the delay period has elapsed a firing pulse is supplied to a firing electrode 31 of a serially connected flash lamp 32. A storage capacitor 33, having previously been charged from a high voltage apparatus 64, is connected in parallel to the lamp 32 and is discharged. A radiation surge pulse passes through condenser lens 34, the latter being located in front of a window 9 of the case 7. A sensor, (not shown) receiving the simulated initial flash of a nuclear weapon explosion is positioned in front of the case 7. In order to test eye protection shutters against the initial flashes of nuclear weapon explosions the further delay element 4 is coupled to the flash lamp circuit and starts when the lamp 32 becomes operative to supply a firing pulse to a firing electrode 51 of a flash lamp 52 of the second flash apparatus 5 after a pre-defined delay period has elapsed. The lamp 52 is connected in parallel to a capacitor 53 which has been charged by a high voltage apparatus 65, and is provided with a condenser lens 54 which is located in from of a window 10 in the case 7. In use the closing of the switch 16 causes a first light flash to be passed through the window 9 but a second exceptionally bright light will be prevented from being perceived in the window 10 if the protective shutters (not shown) are functioning correctly.