To find solidity of a sphere, multiply cube of diameter by .5236.
To find side of an equal square, multiply diameter by .8862.
To find cubic inches in a ball multiply cube of diameter by .5236.
Doubling the diameter of a pipe increases its capacity four times.
A gallon of water (U. S. standard) weighs 8 1-3 pounds and contains 231 cubic inches.
A cubic foot of water contains 7½ gallons, 1728 cubic inches, and weighs 62½ pounds.
To find the pressure in pounds per square inch of a column of water multiply the height of the column in feet by .434.
Steam rising from water at its boiling point (212 degrees) has a pressure equal to the atmosphere (14.7 pounds to the square inch).
A standard horse power: The evaporation of 30 lbs. of water per hour from a feed water temperature of 100 degrees F. into steam at 70 lbs. gauge pressure.
To find capacity of tanks any size; given dimensions of a cylinder in inches, to find its capacity in U. S. gallons: Square the diameter, multiply by the length and by .0034.