132 HORTICULTURIST'S RULE-BOOK. 



10. Square or Surface Measure. 



144 square inches =1 square foot. 



9 square feet .... . . . . = 1 square yard. 



30 square yards = 1 sq. rod or perch. 



100 square rods =1 acre. 



640 acres = 1 sq, mile or section. 



sq.m. a. sq. rd. sq. yd. sq. ft. sq. in. 



1 = 640 = 102,400 = 3,097,600 = 27,878,400 = 4,014,489,600 



1 = 160 = 4,840 = 43,560 = 6,272,640 



1 = 30^ = 272 = 39,204 



1= 9. = 1,296 



1 = 144 



11. Surveyors' Square Measure. 



625 square links =1 square rod or pole. 



16 poles =1 square chain. 



10 square chains =1 acre. 



640 acres = 1 sq. mile or section. 



36 square miles (6 miles square) . . = 1 township. 



tp. sq. mi. a. sq. ch. sq. rd. sq. 1. 



1 = 36 = 23,040 = 230,400 = 3,686,400 = 2,304,000,000 



1 = 640 = 6,400 = 102,400 = 64,000,000 



1= 10= 160= 100,000 



1 = 16 = 10,000 



1 = 625 



12. Solid or Cubic Measure. 



1728 cubic inches =1 cubic foot. 



27 cubic feet =1 cubic yard. 



16 cubic feet =1 cord foot. 



8 cord feet, or 128 cubic feet . . = 1 cord of wood. 

 24| cubic feet =1 perch. 



cu.yd. cu.ft. cu. in. cd. cd. ft. cu. ft. cu. in. 

 1 = 27 = 46,656 = 1 = 8 = 128 = 221,184. 



13. Miscellaneous Measures. 



fa of an inch = a line (American). 



of an inch . . . = a line (French). 



