CHAPTER XII. 



COMPUTATION TABLES. 



I. Tables of Customary Weights and Measures. 



I . Avoirdupois or Commercial Weight. 



2711 grains =1 dram. 



16 " drams =1 ounce. 



16 ounces =1 pound. 



25 pounds =1 quarter. 



4 quarters, or 100 pounds . . . . = 1 hundredweight. 



20 hundredweight, or 2000 lbs. . . . = 1 ton. 



480 pounds =1 imperial quarter 



100 pounds is also called 1 cental. 



t. cwt. U). oz. dr. gr, 



1 = 20 = 2000 = 32,000 = 512000 

 1 = 100 = 1,600 = 25600 



1 = 16 = 256 = 7000 

 1 = 16 = 4375 



2. Troy or Jewelers' Weight. 



24 grains =1 pennyweight. 



20 pennyweights =1 ounce. 



12 ounces =1 pound. 



lb. oz. pwt. gr. 



1 = 12 = 240 = 5760 



1 = 20 = 480 



1 = 24 



3. Apothecaries' Weight. 



20 grains =1 scruple. 



a ^scruples =1 dram. 



K 129 



