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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />..... <br /> <br /> <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />- 33 - <br /> <br />amplifiers opened. The pen remains in the last valid position until a stable <br />signal is received when it lowers onto the map and continues to trace the <br />flight path. <br />As an additional aid in post-flight data analysis, small recognizable <br />puls~s are applied to the pen every two minutes. The pulses are posi ti ve <br />during even hours and negative during odd hours. <br />This aircraft position plotter has proven invaluable in our ~esearch <br />work, particularly in the accurate positioning of the aircraft during <br />cloud seeding. <br />L 3. 7 Artificial Cloud Seeding Systems <br />The B-23 is equipped with a variety of systems for artifically seeding <br />both cold and warm clouds (Fig. 1.2). A brief description of each system is <br />given below. <br />(a.) Silver iod~de pyrotechnic cartridge ejection flares. <br />A rack containing 52 cartridges is located beneath the instrument pod <br />(S in Fig. 1.2). Up to 130 grams of silver iodide is contained in each <br />cartridge and is ejected from the cartridge by a small electrically fired <br />charge. The projectiles can be fused to dispense the silver iodide over a <br />specified path length after falling freely for a certain distance. These <br />delay units are extremely useful in the Cascade Program where often the <br />clouds to be artificially seeded are below the permissible flight level in <br />the mountains. <br />(b.) In situ silver iodide pyrotechnic flares. <br />This system prov~des a source of silver iodide particles generated <br />pyrotechnically which is fixed to the aircraft. Two racks, each of which can <br />carry 24 flares (each flare can contain up to 500 grams of silver iodide), <br />are located permanently on the aircraft (K and T in Fig. 1.2). Two <br /> <br />