Livermore, CA: Lawrence Livermore Laboratory, 1978. Prepriint Presumed first printing thus. Wraps. [1], 4 pages. Illustrations. This paper was prepared for submission to the Thirteenth Pulse Power Symposium in Buffalo, NY, June 19-22, 1978. Stapled at upper left corner. Results were to be presented on the design and testing of a pressurized gas blown spark gap switch capable of high repetition rates in a burst mode of operation. The switch parameters which had been achieved were as follows: 220-KV, 42-kA, a five pulse burst at 1-kHz, 12-ns risetime, 2-ns jitter at a pulse width of 50-ns. The construction of the coaxial spark gap is illustrated in Figure 1. The spark gap bolts on to the lower end of a 5.2 coaxial water Blumlein and was designed to switch the mid conductor to ground. The Blumlein's mid conductor feeds through a polycarbonate resin insulator which interfaced between the water and the high pressure gas and become the switch's anode. More