Bellows, an apparatus so contrived, as alternately to inspire and expel the air. This machine is too well known to require a particular description. It is used in chambers, kitchens, forges, and founderies, as likewise for organs, and other pneumatic instruments, to introduce into them a proper volume of air.

Anacharsis, the Scythian, is recorded as the inventor of bellows. Their action bears an affinity to that of the lungs; for what is called blowing in the former; is an illustration of respiring in the latter. Animal life may, on some occasions, be supported by blowing into the lungs with a pair of bellows; especially in accidents of drowning or suffocation.

Hessian Bellows, a contrivance for supplying a mine with fresh air, for the respiration of the miners. This machine has been improved by M. Papin, who has changed its cylindrical into a spiral form.