A fuse or lit splinter of wood.
the first rapid fire gun was the hand crannked gatling gun used in the civil war but the maxim was the first true machine gun which was developed not long after the gatling
The aircraft mounted machine gun was at first simply a ground machine mounted for a gunner to fire. All sides in WW1 used it. The first successful machine gun fired by a pilot was the Lewis machine gun on a special mounting attached to the top wing, allowing the gun to fire over the propellor.
No
The first gun was thought to have been used in 1132. This was called a fire lance and was similar to a flame thrower. The more modern style of gun came about in Europe in the late 1300s.
Well bows and slingshots were the first use of fire arms ever. The first "GUN" was the musket and musketoon,a fire arm capable of firing anything that will fit.
It didn't replace any gun, it was the first rapid fire weapon to be made.
It was among the very first guns.
You must go into detail on what you mean by "rapid fire" in order to get an answer.
Fire lance AKA the worlds first firework and firearm
Fire lance AKA Worlds first firework and firearm
Machine guns were first used in the trenches of the First World War. They were mainly used as defensive weapons because they were too heavy to carry, and they required three or so men to operate them. The first true rapid fire gun, the Gatling gun, was used after the Civil War in engagements against Indian tribes.
China was the first to discover gun powder, is that what you mean.