A hand grenade is a hand-held bomb, made to be thrown by a soldier. The word "grenade" has a Spanish origin in the word granada ("pomegranate"), in reference to the general size of early grenades, and because its content of shrapnel pellets reminded them of the seeds in a pomegranate. Grenadiers were originally a class of soldier specialized in throwing grenades. Some grenades are designed to be fired by a grenade launcher.
Some grenades are cylindrical and are designed to be fired from riot guns designed for the purpose.
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Such an example of a booby trap is to trap a door frame. Place the grenade about half an arm-length above one's head (most people do not look up; they watch their feet or their hands). When the door is opened, the booby trap should release the grenade's handle. The grenade should stay in place up high, so that it cannot be kicked away.
Booby traps are also used on vehicle gas tanks, and in doing so, are triggered when the vehicle drives away.
The Gatling gun was the first successful machine gun. Unlike previous devices it was the first to combine reliability, high firing rate and ease of loading into a single device. It was designed by the American inventor Richard J. Gatling in 1861 and patented on May 9, 1865.
However, Gatling-style guns with rotating barrels were to return as very high rate-of-fire weapons in military aircraft and ship-based anti-missile defence systems, with electric motors replacing mechanical cranks for rotation. One example is the M61 Vulcan 20 mm cannon, the most commonly used member of a family of weapons designed by General Electric. The Vulcan is a six-barrelled electric Gatling capable of firing more than 6,000 rounds per minute, a rate unachievable with a conventional machine gun. A variety of similar weapons are available in calibers ranging from 5.56 mm to 30 mm, the rate of fire being somewhat proportional to the size and mass of the ammunition (which also determines the size and mass of the barrels).