(J. H. McGowan Co.) ──────────────┬─────────────┬─────────────┬─────────────┬────────────── Size of Pump │ │ │ Capacity, │ Approximate and Suction │ Discharge │ Steam Pipe, │ Gallons per │ Horse-power Pipe, Inches │Pipe, Inches │ Inches │ Minute │ Required ──────────────┼─────────────┼─────────────┼─────────────┼────────────── ¾│ ½│ ⅜│ 8│ 2 1│ ¾│ ½│ 15│ 3 1¼│ 1│ ½│ 20│ 4 1½│ 1¼│ ¾│ 30│ 6 2│ 1½│ ¾│ 40│ 8 2½│ 2│ 1│ 50│ 10 3│ 2½│ 1│ 60│ 15 4│ 3½│ 1¼│ 85│ 25 ──────────────┴─────────────┴─────────────┴─────────────┴────────────── =140. Steam Vacuum Pumps.=—This type of pump depends on the condensation of steam in a closed chamber to create a vacuum which lifts water into the chamber previously occupied by the steam and from which the water is ejected by the admission of more steam. The best known pumps of this type are the Pulsometer, manufactured by the Pulsometer Steam Pump Co., the Emerson, manufactured by the Emerson Pump and Valve Co., and the Nye Pump, manufactured by the Nye Steam Pump and Machinery Co. [Illustration: FIG. 98.—Pulsometer Steam Vacuum Pump. ]