USEFUL TABLES 43 



A quadrant is one-fourth the circumference of a circle, or 

 90; a sextant is one-sixth of a circle, or 60. A right angle 

 contains 90. The unit of measurement is the degree, or ^ of 

 the circumference of a circle. 



AVOIRDUPOIS WEIGHT 



437J grains (gr.) =1 ounce oz. 



16 ounces =1 pound Ib. 



100 pounds =1 hundredweight cwt. 



20 cwt., or 2,000 Ib = 1 ton T. 



1 T. = 20 cwt. = 2,000 Ib. = 32,000 oz. X 14,000,000 gr. 

 The avoirdupois pound contains 7,000 gr. 



LONG-TON TABLE 



16 ounces (oz.) =1 pound Ib. 



112 pounds = 1 hundredweight cwt. 



20 cwt., or 2,240 Ib =1 ton T. 



TROY WEIGHT 



24 grains (gr.) =1 pennyweight pwt. 



20 pennyweights =1 ounce oz. 



12 ounces =1 pound Ib. 



1 Ib. = 12 oz. = 240 pwt. = 5,760 gr. 



DRY MEASURE 



2 pints (pt.) =1 quart qt. 



8 quarts =1 peck pk. 



4 pecks =1 bushel bu. 



1 bu. = 4 pk. = 32 qt. = 64 pt. 



The U. S. struck bushel contains 2,150.42 cu. in. = 1.2444 

 cu. ft. By law, its dimensions are those of a cylinder 18| in. 

 in diameter and 8 in. deep. The heaped bushel is equal to 

 1J struck bushels, the cone being 6 in. high. The dry gallon 

 contains 268.8 cu. in., being f struck bushel. 



For approximations, the bushel may be taken as 1J cu. ft.; 

 or 1 cu. ft. may be considered I bu. 



The British bushel contains 2,218.19 cu. in. = 1.2837 cu. ft. 

 = 1.032 U.S. bushels. 



