Gatling gun.

The Gatling gun may have been the first "machine gun", depending on how machine gun is defined, as it was capable of firing continuous bursts of fire. Unlike designs like the Maxim gun, which operate the mechanism using a fraction of the power of the fired cartridge, the Gatling gun relies on external power, such as a hand crank, or motor. Some later Gatling-type weapons diverted gas from the barrels to spin the rotating barrels.