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Appendix II. Tables of weights and measures.

Related entry: Thomas: Weights and Measures.

from The Dispensatory of the United States of America, Wood & Bache, 13th ed., 1876

Scanned version copyright © 2000–2014 Henriette Kress.

Apothecaries' weight. U.S.

Pound. Troyounces. Drachms. Scruples. Troy Grains.
℔ 1 = 12 = 96 = 288 = 5760
℥ 1 = 8 = 24 = 480
ℨ 1 = 3 = 60
℈ 1 = gr. 20

The Imperial Standard Troy weight, at present recognised by the British laws, corresponds with the Apothecaries' weight in pounds, ounces and grains, but differs from it in the division of the ounce, which, according to the former scale, contains twenty pennyweights, each weighting twenty-four grains.

Avoirdupois weight. Br.

Pound. Ounces. Drachms. Troy Grains.
℔ 1 = 16 = 256 = 7000
oz. 1 = 16 = 437.5
dr. 1 = gr. 27.34375

Relative value of Troy and Avoirdupois Weights.

Pound. Pounds. Pound. Ounces. Grains.
1 Troy = 0.822857 Avoirdupois = 0 = 13 = 72.5
1 Avoirdupois = 1.215277 Troy = 1 = 2 = 280

Apothecaries' or Wine Measure. U.S.

Gallon. Pint. Fluidounces. Fluidrachms. Minims. Cubic Inches.
Cong. 1 = 8 = 128 = 1024 = 61440 = 231
O 1 = 16 = 128 = 7680 = 28.875
f℥ 1 = 8 = 480 = 1.8047
fℨ 1 = ♏ 60 = 0.2256

Imperial measure.

Adopted by the British Pharmacopoeia.

Gallon. Pints. Fluidounces. Fluidrachms. Minims.
1 = 8 = 160 = 1280 = 76800
1 = 20 = 160 = 9600
1 = 8 = 480
1 = 60

Relative Value of Apothecaries' and Imperial Measure.

Apothecaries' Measure Imperial Measure.
Pints. Fluidounces. Fluidrachms. Minims.
1 gallon = 6 13 2 23
1 pint = 16 5 18
1 fluidounce = 1 0 20
1 fluidrachm = 1 2.5
1 minim = 1.04
Imperial Measure. Apothecaries' Measure.
Gallon. Pints. Fluidounces. Fluidrachms. Minims.
1 gallon = 1 1 9 5 8
1 pint = 1 3 1 38
1 fluidounce = 7 41
1 fluidrachm = 58
1 minim = 0.96

Relative Value of Weights and Measures in Distilled Water at 60° Fahrenheit.

1. Value of Apothecaries' Weight in Apothecaries' Measure
Pints. Fluidoz. Fluidr. Minims.
1 pound = 0.7900031 pints = 0 12 5 7.2238
1 ounce = 1.0533376 fluidounces = 0 1 0 25.6020
1 drachm = 1.0533376 fluidrachms = 0 0 1 3.2002
1 scruple = 0 0 0 21.0667
1 grain = 0 0 0 1.0533
2. Value of Apothecaries' Measure in Apothecaries' Weight.
Gr. Grains.
1 gallon = 10.12654270 pounds = 10 1 4 0 8.88 = 58328.886
1 pint = 1.26581783 pounds = 1 3 1 1 11.11 = 7291.1107
1 fluidounce = 0.94936332 ounces = 0 0 7 1 15.69 = 455.6944
1 fluidrachm = 0.94936332 drachms = 0 0 0 2 16.96 = 56.9618
1 minim = 0.94936332 grains = = .9493
3. Value of Avoirdupois Weight in Apothecaries' Measure.
Pints. Fluidoz. Fluidr. Minims.
1 pound = 0.9600732 pints = 0 15 2 53.3622
1 ounce = 0.9600732 fluidounces = 0 0 7 40.8351
4. Value of Apothecaries' Measure in Avoirdupois Weight.
1 gallon = 8.33269800 pounds.
1 pint = 1.04158725 pounds.
1 fluidounce = 1.04158725 ounces.
5. Value of Imperial Measure in Apothecaries' and Avoirdupois Weights.
Imperial Measure. Apothecaries' Weight. Avoirdupois Weight. Grains. Cubic Inches.
1 gallon = 12 ℔ 1 ℥ 6 ℨ 2 ℈ 0 gr. = 10 ℔ 0 oz. = 70,000 = 277.27384
1 pint = 1 6 1 2 10 = 1 4 = 8,750 = 34.65923
1 fluidounce = 7 0 17.5 = 1 = 437.5 = 1.73296
1 fluidrachm = 2 14.69 = = 54.69 = 0.21662
1 minim = = = .91 = 0.00361


And, in case you're tired of all those weird measurements, here's how you convert to nice'n'easy metrics (compleat with European decimal notation) (this is not from any Dispensatory; it's from and by Henriette):

Weight
Troy: pound ounce drachm scruple grain gram
1 12 96 288 5760 373,24170
1 8 24 480 31,10348
1 3 60 3,88793
1 20 1,29598
1 0,06480
Avoirdupois: pound ounce drachm troy grain gram
1 16 256 7000 453,59234
1 16 437,5 28,34952
1 27,34375 1,77185
1 0,06480
Imperial Troy: pound . ounce . pennyweight grain gram
1 12 240 5760 373,24170
1 20 480 31,10348
1 24 1,55517
1 0,06480
Volume
Troy: gallon pint fluidounce . fluidrachm minim milliliter
1 8 128 1024 61440 . 3785,41179
1 16 128 7680 473,17647
1 8 480 29,57353
1 60 3,69669
1 0,06161
Imperial: gallon pint fluidounce fluidrachm minim milliliter
1 8 160 1280 76800 4546,09120
1 20 160 9600 568,26140
1 8 480 28,41307
1 60 3,55163
1 0,05919


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