WEIGHTS AND MEASURES. 349 



III. WEIGHTS AND MEASURES. 



CUST03IAKY SYSTi:3I OP AVEIGHTS AND 



MEASURES. 



I. Weights. 



A, AVOIRDUPOIS WEIGHT. 



I ton = 2000 pounds (lbs.);* 



I lb. s= i6 ounces (oz.) = 256 drams = 768 scruples = 7680 grains ; 



I oz. = 16 drams = 48 scruples = 480 grains ; 



I dram = 3 scruples = 30 grains ; 



I scruple = 10 grains. 



B. APOTHECARIES' WEIGHT, FOR DRUGS. 



I lb. = 12 oz. = 96 drams = 288 scruples = 5760 grains; 



I oz. = 8 drams = 24 scruples = 480 grains; 



I dram = 3 scruples =r 60 grains; 



I scruple = 20 grains. 



C TROY WEIGHT, FOR JEWELS AND PRECIOUS METALS. 



z lb. = 12 oz. = 24 carats = 240 pennyweight (dwt.) = 5760 grains ; 



I oz. = 2 carats = 20 dvvts. = 480 grains ; 



I carat = 10 dwts. = 240 grains ; 



I dwt. = j>4 grains. 



II. Pleasures. 



A. LINEAR. 



I mile = 8 furlongs (frigs.) = 80 chains = 320 rods = 528a feet ;+ 

 z furlong = 10 chains = 40 rods = 660 feet ; 



I chain = 4 rods = 66 feet ; 



I rod = i6Jfeet; 

 I chain = 100 links ; 



I linl£ = 7.92 inches ; 

 I 3rard = 3 feet = 36 inches ; 

 I foot = 12 inches. 



B. SURFACE. 

 I square mile == 640 acres ; 



I acre = 10 square chains = 160 sq. rods = 4840 sq. yds, 

 = 43,560 square feet. 



* I long ton = 20 imperial hundredweights (cwt ) = 22.^0 pounds. 

 t I sea mile (Admiralty knot) = 6080 feet, or 1.15T5 statute milg, 



