MEASURES AND WEIGHTS. 



WBICHTT. 



The standard avoirdupois pound is the weight of 

 27.7015 cubic inches of distilled water weighed in air at 

 39.83, the barometer at 30 inches. 



A cubic inch of water weighs 252.6937 grains. 

 AVOIRDUPOIS. 



16 drachms I ounce. 



16 ounces 1 pound. 



112 pounds 1 cwt. 



20 cwt I ton. 



Drachms. Ounces. Pounds. 



256 



28672 1792 



573440 35840 2240 



1 pound=14 oz. 11 pwts. 16 grs. troy, or 7000 grains. 

 1 ounce=18 dwts, 5.5 grains troy or 437.5 grains. 



TROY. 



24 grains 1 dwt. Grains. Dwt. 



20 dwt 1 ounce. 480 



12 ounces 1 pound. 5760 240 



7000 troy grains 1 Ib. avoirdupois. 



437.5 troy grains 1 oz. " . 



175 troy pounds, 144 Ibs " 



175 troy ounces , 192 oz. " 



1 troy pound ,822857 Ib. 



1 avoirdupois pound 1.21578 Ibs. troy. 



APOTHECARIES. 

 20 grains 1 scruple. 



3 scruples 1 drachm. 



8 drachms 1 ounce. 



12 ounces 1 pound. 



45 drops 1 teaspoonful or a fluid drachm. 



2 tablespoonfuls 1 ounce. 



The pounds ounce and grain are the same as in troy 

 weight. 



