MISCELLANEOUS TABLES AND INFORMATION 297 
HANDY EQUIVALENTS 
There are 160 square rods in an acre. 
A square acre is 208.71 feet on a side. 
118 feet is approximately the radius of a circular acre, 
83 feet of a half acre, and 59 feet of a quarter acre. 
There are 5280 feet in a mile. 
A meter contains 39.37 inches; a kilometer is .62 mile. 
A liter contains 61 cubic inches, — nearly the contents 
of a quart. 
A hectare contains 2.47 acres. 
A gram weighs 15.432 grains, Troy weight. 
A kilogram or kilo contains 2.2 lbs avoirdupois. 
There are 231 cubic inches in a U. S. liquid gallon. 
There are 2150.42 cubic inches in a U. S. struck bushel. 
A horsepower is the work done in lifting 33,000 pounds 
1 foot in 1 minute. A flow of 528 cubic feet of water per 
minute with 1 foot fall generates one horsepower. 
A miner’s inch is the flow of water through an orifice 
1 inch square under a head (in some States) of 6 inches. 
In California 50 miner’s inches equal 1 cubic foot per 
second, equal 1.9835 acre feet per day, nearly an inch an 
hour. In some States 40 miner’s inches equal this flow. 
NO. OF PLANTS PER ACRE WITH 
DIFFERENT SPACING 
Spacing 
No. 
3 X 3 ft. 
4840 
4X4 
2720 
5X5 
1740 
6 X6 
1210 
7X7 
890 
8 *X 8 
680 
9X9 
538 
10 X 10 
436 
