ARITHMETIC 293 



sq. in. sq. ft. sq. yd. sq. rd. A . ^ 



144 = 1 



1,296= 9 = 1 



39,204= * 272 J = 30 J= 1 



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

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



SURVEYORS' SQUARE MEASURE 



625 square links (sq. li.) =1 square rod . . sq. rd. 



16 square rods =1 square chain . sq. ch. 



10 square chains =1 acre A. 



640 acres =1 square mile . . sq. mi. 



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



A square measuring 208.71 ft. on each side contains 1 A. 

 The following are the comparative sizes, in square yards, 

 of acres in different places: 



sq. yd. 

 England and America 4,840 



Scotland 6,150 



Ireland 7,840 



Hamburg 11,545 



sq. yd. 



Amsterdam 9,722 



Dantzic 6,650 



France 11,960 



Prussia 3,053 



CUBIC MEASURE 



1,728 cubic inches (cu. in) =1 cubic foot cu. ft. 



27 cubic feet =1 cubic yard cu. yd. 



128 cubic feet =1 cord of wood. 



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



1,728 = 1 

 46,656 = 27 = 1 



MEASURES OF WEIGHT 



AVOIRDUPOIS WEIGHT 



16 ounces (oz.) =1 pound Ib. 



100 pounds =1 hundredweight .... cwt. 



20 hundredweight 1 , 



2,000 pounds ,/ ~ lton T ' 



oz. Ib. cwt. T. 

 16= 1 

 1,600= 100= 1 

 32,000 = 2,000 = 20=1 



