A Lot of Air......

This is the back of the instrument. This particular instrument was hand pumped for the first half century of its life. Yep, it took two people: one to pump and one to play.

Basically, you just raise and lower the pump handle. It is attached to two bellows underneath the reservoir. One is always discharging wind and the other is drawing in air. The springs that provide the pressure are also visible.

It is not that hard to pump, unless you have an organist that likes to play big chords with all the stops on.......

The opening for the electric blower still exists. The purchaser has not decided if they will install the blower or just use the pump.

I will say this though: this gives a whole new meaning to the term: "aerobic exercise."