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They didnt THey would get killed by machine gunners or artillery fire. 1 Man with machine gun = 40 rifle men
If you are referring to tracer bullets they were originally used by machine gunners to see where their fire was going in order to correct their aim and then hit whatever they were shooting at.
rotating the handles on the gunners ejection seat started the ejection sequence, stowing the gunners control column, unlocking the hatch and firing the hatch lifters on the escape hatch
Fire one of them...
they are made out of a ceramic material. If placed in a fire, they melt and can start on fire.
The bipod was originally used for the exact same thing it's used for today - to stabilize the weapon in situations where it can't (or simply won't) be mounted on a tripod. A unit who comes under ambush while traveling, for example - their machine gunners aren't going to wait for the AGs to break out the tripod and mount it before they return fire.
Shotguns, using "clay pigeons" used in skeet and trap- to teach the concept of "leading" a moving target. Belt fed .30 caliber machine guns, using a frangible, nonmetalic bullet- used to fire at an armored fighter that had devices to sense and record hits. .50 caliber Browning machine guns- the standard WW 2 gun of a US bomber gunner.
Volley fire was intended to deliver massed effects against massed targets. Fire at will allowed the soldiers to fire at their own time, when they had their target in their sights.
Most true fighter planes of World War one would have one or two forward mounted machine guns mounted to the fuselage, synchronized to fire through the propeller. Some however might also have machine gun mounted to the upper wing, and pilots were known to drop grenades on enemy ground targets.
Machine guns are often placed near bunkers to defend them, and to ensure that the said bunker isn't breached by enemy forces. Machine guns are capable of providing heavy fire that can stop large groups of enemy combatants in their tracks, and maintain dominance on the battlefield. They're also perfect for suppressing fire, which can pin down the enemy and stop their advance. For more information, please specify the war your question pertains to.
A wheel and axle
Time Machine Fire at Sea - 2000 TV was released on: USA: 17 May 2000