Home › Weights And Measures › Weights and Measures (Troy Weight is used)

Weights and Measures (Troy Weight is used)

Troy Weight is used by jewellers and at the | 277-274 cubic inches = 70,000 grains = 10 lb. av. Mint. Its denominations are the pound, lb., = 12 ounces = 5,760 grains; ounce, oz., = 480 grains; and pernyweight, dwt., = 24 grains. is used. The minim of the former = 95 gr., of the latter = .91 gr. The former contains 16 fluidounces to the pint (0.), the latter 20. The following tables give the value of each in grains of pure water, at 60°. 480 Apothecaries' Weight is used in prescribing and dispensing medicines, and in chemical and pharmaceutical operations generally. It is the officinal standard of the U. S. Pharmacopeia. The British Pharmacopœia uses the avoirdupois pound and ounce; hence the two agree only in the grain measure. The denominations of apothecaries' 61,440 weight are the pound, fb, = 12 ounces = 5,760 grains; the ounce, 3j, = 8 drachms = 480 grains; the drachm, 3j, = 3 scruples = 60 grains; the scruple, j, 20 grains; and the grain, gr.

Avoirdupois Weight is the commercial weight, and is generally employed in the receipts in this volume. Its pound, lb., = 16 ounces, oz., = 7,000 grains. The ounce contains 437.5 grains. The apothecaries' or troy ounce contains 42 grains more than the avoirdupois ounce, and the apothecaries or troy pound contains 1·240 grains less than the commercial or avoirdupois pound. The troy pound contains 12 oz., the avoirdupois 16 oz.