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Updated: May 27, 2025

But 4768 square inches multiplied by 12 inches in height is 57224.4 cubic inches, or 33.1 cubic feet, and this is the quantity of steam which must be expended per minute to produce an actual horse power. Q. But are 33 cubic feet of steam expended per minute equivalent to a cubic foot of water expended in the hour? A.. Not precisely, but nearly so.

C.E. John Bourne - A Catechism of the Steam Engine