How an organ works 1

	Where it all starts. Originally this organ was pumped by hand (usually by choirboys). Now it is replaced by an electric pump which blasts air into a large weighted reservoir.
	Before the air enters the reservoir , it passes through a regulator. As the bellows in the reservoir get higher, so the regulator valve ( a series of shutters) is closed off, letting less air into the reservoir. As the bellows fall the shutters in the regulator are opened, allowing more air from the pump into the reservoir.
	The large reservoir stores up all the necessary air to power the organ. The bellows are weighted to provide a uniform and consistent pressure to the pipes.

	A diagram explaining and showing the above photographs. Air is pumped into the bellowed reservoir, and then allowed out into the pipes at a constant pressure. When the organist is not playing and no air is being used the regulator is shut, keeping a constant pressure in the system.
Moving on