518 



COMPUTATION TABLES 



Surveyors' or chain measure 



7.92 inches =1 link. 



25 links =1 rod or pole. 



4 rods, or 66 feet =1 chain. 



80 chains =1 mile. 



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 



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. 



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. 



