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An Egyptian man using bellows on a fire.

Bellows

An Egyptian man using bellows on a fire.

The harmonium is a type of keyboard instrument similar to an organ. The sound is produced by air using foot or hand operated bellows, producing a sound similar to an organ.

Harmonium

The harmonium is a type of keyboard instrument similar to an organ. The sound is produced by air using…

"An instrument called the hydrostatic bellows, also shows, in a striking manner, the great force of a small quantity of water, pressing in a perpendicular direction. This instrument consists of two boards, connected together with strong leather, in the manner of the common bellows. It is then furnished with a tube a, which communicated between the two boards. A person standing on the upper board may raise himself up by pouring water into the tube. If the tube holds an ounce of water, and has an area equal to a thousandth part of the area of the top of the bellows, one ounce of water in the tube will balance a thousand ounces placed on the bellows." —Comstock, 1850

Hydraulic Bellows

"An instrument called the hydrostatic bellows, also shows, in a striking manner, the great force of…