. Complete arithmetic . a barrel of porkor of beef 200 lb. A cask of lime weighs 240 lb. 176. Troy and Apothecaries* Weight. Goldsmiths still usea system known as troy tveight, and in compounding medi-cines apothecaries use a table of their own. These are notof enough importance to be generally taught, but are insertedhere for reference. The table of troy weight is as follows: 24 grains (gr.) = 1 pennyweight (pwt. or dwt.)20 pennyweights = 1 ounce (oz.)12 ounces = 1 pound (lb.) The avoirdupois pound contains 7000 gr., the troy pound 5760 gr. A carat weight, used in weighing diamonds, is common
. Complete arithmetic . a barrel of porkor of beef 200 lb. A cask of lime weighs 240 lb. 176. Troy and Apothecaries* Weight. Goldsmiths still usea system known as troy tveight, and in compounding medi-cines apothecaries use a table of their own. These are notof enough importance to be generally taught, but are insertedhere for reference. The table of troy weight is as follows: 24 grains (gr.) = 1 pennyweight (pwt. or dwt.)20 pennyweights = 1 ounce (oz.)12 ounces = 1 pound (lb.) The avoirdupois pound contains 7000 gr., the troy pound 5760 gr. A carat weight, used in weighing diamonds, is commonly taken inthe United States as grains. The word carat, meaning ^■^, is usedalso in speaking of the purity of gold. Hence 18 carats fine means^1 pure gold and /^j alloy. The table of apothecaries weight is as follows: 20 grains (gr.) = 1 scruple (sc. or 9)3 scruples = 1 dram (dr. or 5)8 drams = 1 ounce (oz. or § )12 ounces = 1 pound (lb.) Physicians often use the metric system, explained later. WEIGHT MEASURE 171. Ky-.):,: ..■.;-:s:iia)»«a! EXERCISE 89 1. In this load of hay there are 2150 lb. Express thisas tons and a common fraction. 2. If there were 1850 lb. in the load, what decimal of aton would there be ? 3. How many grains are there in 56 troy pounds ? 4. The avoirdupois pound is how many times as heavyas the troy pound ? Reduce to the next lower units: 5. 16 lb. 7. 21 lb. 9. 16 T. 6. 27 lb. 8. 81 lb. 10. 23 T. 11. 2^ T. 12. 161 T. Reduce to higher units: 13. 176 oz. 14. 200 oz. 15. 32,000 oz. 16. 10,000 lb. Reduce to ounces: 17. 29| lb. 18. 56f lb. 19. 54^3^ lb. 20. 271b. 5 oz. Reduce to pounds: M. 27 T. 22. T. 23. 144 oz. 24. 3T. 7001b. 172 DENOMINATE NUMBERS 1
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