APOTHECARIES' WEIGHT .

20 grains = 1 scruple = 20 grains

3 scruples = 1 drachm = 60 grains

8 drachms = 1 ounce = 480 grains

12 ounces = 1 pound = 5,760 grains

Fluid Measure

60 minims = 1 fluidrachm

8 drachms = 1 fluidounce

20 ounces = 1 pin

t 8 pints = 1 gallon

The above weights are usually adopted in formulas.

All chemicals are usually sold by

Avoirdupois Weight

27 and 11/32 grains = 1 drachm= 27 and 11/32 grains

16 drachms = 1 ounce = 437.5 grains

16 ounces = 1 pound =7,000 grains

Precious metals are usually sold by

Troy Weight

24 grains             = 1 penny weight = 24 grains

20 pennyweights =1 ounce            = 480 grains

12 ounces            = 1 pound           =5,760 grains

Note

An ounce of metallic silver contains 480 grains, but an ounce of nitrate of silver contains only 437.5 grains.