518 COMPUTATION TABLES 



Surveyors 1 or chain measure 



7.92 inches =1 H n k 



25 links . = 1 rod or pole. 



4 rods, or 66 feet =1 chain. 



80 chains =1 m ii e . 



mi. ch. rd. 1. in. 



1 = 80 = 320 = 8000 = 63,360 

 1 = 4 = 100 = 792 

 1 = 25 = 198 



1 = 7.92 



Square or surface measure 



144 square inches =1 square foot. 



9 square feet =1 square yard. 



30^ square yards = 1 sq. rod or perch. 



160 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 = 30M = 272M = 39,204 



1 = 9 = 1,296 



1 = 144 



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 



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 



