Gabions
- Cylindrical baskets of various dimensions, open at both ends, used to revet the interior slopes of batteries, tghe cheeks of embrasures, and to form the parapet of trenches.*
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Grain
- A unit of measure based upon the weight of a single grain of barley. Bullet and propellant powder weights are measured in grains. There are 437.5 grains in an ounce.
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Grape-Shot
- A Certain number of cast-iron balls put together by means of two cast iron plates, two rings, and one pin and nut. Canister has superseded the use of grape in field-guns.*
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Groove
- A notch cut into the body of a bullet around its circumference to hold lubricant and thought to aid in flight. Usually found on bullets for muzzleloading weapons. See also “ring” and “cannelure.”
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Gun-Cotton
- A common cotton, steeped in a mixture of sulphuric acid and nitric acid, and when properly soaked, is well washed in running water, and then dried. The explosive force of three parts gun-cotton equals that of eight parts of gunpowder.*
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*
definitions from "Military Dictionary", Col. H.L. Scott, 1861
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