Cinematographic annual : 1930 (1930)

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596 CINEMATOGRAPHIC ANNUAL Square Measure 144 sq. inches = 1 sq. ft. 40 sq. rods = I rood 9 sq. ft. = 1 sq. yard ' 4 roods = I acre 30 34 sq. yards = 1 sq. rod 640 acres = 1 sq. mile 43560 sq. ft. = I acre Surveyors' Measure 7.92 inches = 1 link 4 rods = I chain 25 links = 1 rod 10 sq. chains or 160 sq. rods = I acre 640 acres = 1 sq. mile 36 sq. miles (6 miles square) = I township Cubic Measure 1,728 cubic in. = 1 cu. ft. 128 cu. ft. = I cord (wood) 27 cubic ft. = 1 cubic yard 40 cu. ft. = I ton (shpg.) 2,150.42 cubic inches = 1 standard bushel 231 cubic inches = 1 standard gallon (liquid) 1 cubic foot = 4/5 of a bushel To find diameter of a circle multiply circumference by .31831. To find circumference of a circle multiply diameter by 3.1416. To find area of a circle multiply square of diameter by .7854. To find surface of a ball multiply square of diameter by 3.1416. To find side of an equal square multiply diameter by .8862. To find cubic inches in a ball multiply cube of diameter by .5236. A gallon of water (U S Standard) weighs Sy£ lbs. and contains 231 cubic inches. A cubic foot of water contains 7^ gallons, 1728 cubic inches, and weighs 62% lbs. D