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2. Gunter's chain - Wikipedia

   en.wikipedia.org/wiki/Gunter's_chain

   7.92 in. metric (SI) units. 200 mm. Gunter's chain (also known as Gunter's measurement) is a distance-measuring device used for surveying. It was designed and introduced in 1620 by English clergyman and mathematician Edmund Gunter (1581–1626). It enabled plots of land to be accurately surveyed and plotted, for legal and commercial purposes.

3. Link (unit) - Wikipedia

   en.wikipedia.org/wiki/Link_(unit)

   The link (usually abbreviated as "l.", "li." or "lnk."), sometimes called a Gunter’s link, is a unit of length formerly used in many English-speaking countries. In US customary units modern definition, the link is exactly 66100 of a US survey foot, [ 1] or exactly 7.92 inches or 20.1168 cm. The unit is based on Gunter's chain, a metal chain ...

4. Ball chain - Wikipedia

   en.wikipedia.org/wiki/Ball_chain

   Ball chain is a type of chain consisting of small sheet metal balls connected via short lengths of wire. [ 1] The balls are hollow and have two small antipodal holes. These holes accept a short length of wire deformed on the end like a rivet so that the end is bound inside the ball. The wire is then connected to another ball using the same method.

5. Roller chain - Wikipedia

   en.wikipedia.org/wiki/Roller_chain

   Roller chain or bush roller chain is the type of chain drive most commonly used for transmission of mechanical power on many kinds of domestic, industrial and agricultural machinery, including conveyors, wire - and tube - drawing machines, printing presses, cars, motorcycles, and bicycles. It consists of a series of short cylindrical rollers ...

6. M13 link - Wikipedia

   en.wikipedia.org/wiki/M13_Link

   M13 links connect up to 200 7.62×51mm NATO rounds contained in an M19A1 ammunition box used to feed a M240G machine gun. The M13 link, formally Link, Cartridge, Metallic Belt, 7.62mm, M13, is the U.S. military designation for a metallic disintegrating link specifically designed for ammunition belt-fed firearms and 7.62×51mm NATO rounds.

7. List of cannon projectiles - Wikipedia

   en.wikipedia.org/wiki/List_of_cannon_projectiles

   Essential parts of a cannon: 1. the projectile or cannonball (shot) 2. gunpowder 3. touch hole (or vent) in which the fuse or other ignition device is inserted. Round shot or solid shot or a cannonball or simply ball. A solid spherical projectile made, in early times, from dressed stone but, by the 17th century, from iron.