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Bullet |
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bullet [′bu̇l·ət]
(engineering) A conical-nosed cylindrical weight, attached to a wire rope or line, either notched or seated to engage and attach itself to the upper end of a wire line core barrel or other retrievable or retractable device that has been placed in a borehole. Also known as bug; go-devil; overshot. A scraper with self-adjusting spring blades, inserted in a pipeline and carried forward by the fluid pressure, clearing away accumulations or debris from the walls of a pipe. Also known as go-devil. A bullet-shaped weight or small explosive charge dropped to explode a charge of nitroglycerin placed in a borehole. Also known as go-devil. An electric lamp covered by a conical metal case, usually at the end of a flexible metal shaft. (graphic arts) A hollow hemispherical shell, made of iron and filled with pitch, which holds small objects during the execution of artistic designs in metal. (graphic arts) A circle or other graphic character, about the height of a lowercase letter, used to set off items in a list. (materials) A small, lustrous, nearly spherical industrial diamond. (ordnance) The projectile fired, or intended to be fired, from a small arm. Bullet the head of a cartridge for an infantry, hunting, or sporting gun. Bullets for infantry weapons are classified as conventional and special. Conventional bullets are designed to hit personnel deployed in the open or behind shelters that can be penetrated by the bullet. Special bullets, in addition to hitting personnel, may be used as tracers for adjustment of fire and target indication. (They contain a tracer compound, which ignites upon firing and leaves a trace in flight that is visible by day or night.) Armor-piercing bullets are used for engaging lightly armored targets. Other special kinds are incendiary bullets, used for setting easily ignited substances on fire, and armor-piercing incendiary bullets, for hitting and igniting lightly armored targets. Bullets are classified by caliber as small (up to 6.5 mm), normal (7.5-7.69 mm), and large (12.7–15 mm). The bullet is held in the cartridge neck by circular crimping. Explosive dumdums have also been used in some armies. For hunting (smooth-bore) guns there are round and special bullets. The most common special bullets are the Jacan and Brennecke. Want to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit the webmaster's page for free fun content. |
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