Military Engineering Exploits - Multi-Directional Gun-Machine

The middle drawing is of a machine with cannons arranged in the shape of a fan. It could fire single shots or simultaneous rounds of fire.
The machine, on wheels, could be easily moved so that the cannons were facing the direction of the enemy. The crank at the back could be adjusted to alter the height and trajectory of the missiles. It should be noted this machine would have been difficult to reload in the middle of a battle.