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Flare
A flare, also sometimes called a fusee, is a type of pyrotechnic that produces a brilliant light or intense heat without an explosion. Flares are used for signalling, illumination, or defensive countermeasures in civilian and military applications. Flares may be ground pyrotechnics, projectile pyrotechnics, or parachute-suspended to provide maximum illumination time over a large area. Projectile pyrotechnics may be dropped from aircraft, fired from rocket or artillery, or deployed by flare guns or handheld percussive tubes.
==History==
The earliest recorded use of gunpowder for signalling purposes was the 'signal bomb' used by the Song Dynasty Chinese as the Mongol-led Yuan Dynasty besieged Yangzhou in 1276. These soft-shelled bombs, timed to explode in mid-air, were used to send messages to a detachment of troops far in the distance. Another mention of the signal bomb appears in a text dating from 1293 requesting their collection from those still stored in Zhejiang.〔 A signal gun appears in Korea by 1600. The ''Wu I Thu Phu Thung Chih'' or ''Illustrated Military Encyclopedia'' written in 1791 depicts a signal gun in an illustration.〔Needham (1986), p. 331.〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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