Note 44 — Chapter IV · Thomas Newcomen—The Atmospheric Engine.

The illustration shows the several parts of Newcomen’s atmospheric engine. a is the boiler; b, the piston moving up and down; c, the cylinder; d, a pipe proceeding from the top of the boiler, and inserted into the bottom of the cylinder, having a cock, e, to interrupt the flow of steam at pleasure; f, cold-water cistern, from which the cold water is conveyed by the pipe g, called the injection-pipe, and thrown in a jet into the cylinder, b, on turning the injection-cock, h; the snifting-valve, i, enables the air to escape from the cylinder, while the siphon-pipe, j, enables the condensed steam to flow from the same cavity in the form of water; k, the main lever beam; l, the counterpoise or weight hung on the balance-beam, or on m, the pump-rod which works the pump, n.