High altitude flashes

A peculiarity of the class of high-altitude flash charges is that (undoubtedly in connection with spectral emission) they are as effective in the highly rarefied atmosphere as at low altitude." " " As shown in Formulas 47—50, the spectral effects are produced by calcium either as metal or as compound, and additional advantages are gained by the presence of a sodium compound. Information on these developments is found in several Picatinny Arsenal reports." -" ... 

B. Jackson, S. M. Kaye, G. Weingarten, Picatinny Arsenal, Dover, N. J. Development of Substitute Compositions for High Altitude Flash Systems Containing Elemental Calcium, TR 3068, AD 457878 C. A. 65, 12056 (1966). 

Flares. A flare compn is described in Refs 15 16 contg powd Mg, Na perchlorate, and a binder which can be cast and cured, and which has a luminous intensity of 50,500 candle-secs/g Incendiaries. A mixt of 1 OOg of Na perchlorate and 58.7g of powd Al has a Qr of 2751cal/g and can be used as a filler for incendiary bombs (Ref 6). A proc is described in Ref 14 for coating Na perchlorate with Al, and the use of the coated material in incendiaries Photo flash Compositions. Mixts of 80% Ca metal and 20% Na perchlorate and 80% Ca, 10% Na perchlorate, and 10% Na nitrate have been examined as expl photoflash compns for both sea level and high altitude use (Ref 13) Refs 1) Gmelin, System No 21 (1928), 408 Supp Part 1 (1964), 180 2) H.H. Willard ... 

Uses, (see also under Perchlorate Propellants and Explosives). It is used in pyrotechnics to impart a bright red color to flames (Ref 3). A gel was made from 50g of Sr perchlorate, lOOg of me ale, and 4.6g of Carbopol 940 gelling agent. Five g of this gel burned for 10 mins with an intense red flame (Ref 11). A 66/34 mixt of Sr perchlorate/powd Al was tested as a photo-flash compn for both sea level and high altitude use (Ref 8). Another mixt of 50ml of me... 

Zr/Ba(N03)2 46.6/53.4 1105 14 4000 215 (DTA) Flash Charge excellent stability in presence of BlkPdr, moisture, double base propint, ammonia, high altitude... 

Highly accurate trajectory information is required in the development of a missile system. One method of obtaining this information for a missile at high altitudes is to photograph the flash produced by a photoflash cartridge ejected a distance sufficient to prevent damage to the missile in flight. A device was developed which produces a series of flashes with a known time interval between them (Ref 3)... 

The flash point is the lowest temperature at which a liquid gives off enough vapor to ignite when an ignition source is present. The freezing point is especially important for jet aircraft, which fly at high altitudes where the outside temperature is very low. Sulfur content is a measure of corrosiveness. 

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