6031. English Weights and Measures

6031.      English Weights and Measures. Avoirdupois and Troy weight are exactly the same as used in the United States, and the tables will be found in Nos. 5935, etc.. In the new British Pharmacopoeia, the ■weights are expressed in pounds, ounces, and grains, avoirdupois; thus superseding the Apothecaries weight as now in use in the United States. The old British avoirdupois drachm (1/16 ounce or 27.344 grains) is now obsolete, except in weighing silk. The new drachm is 1/8 ounce.

6032. Imperial Standard Measure

6032.    Imperial Standard Measure.

Gal.

Quarts.

Pints.

  

F. Oz.

  

F. Dr.

  

Minims.

1

= 4 =

8

=

160

=

1280

=

76.800

 

1 =

2

=

40

=

320

=

19.200

   

1

=

20

=

160

=

9.600

       

1

=

8

=

480

           

1

=

60

The standard unit of this measure is the gallon which is declared by statute to contain 10 pounds avoirdupois (70,000 Troy grains) of distilled water at a temperature of 62° Fahr., the barometer being at 30 inches. The weight of a cubic inch of water, under the foregoing conditions, is 252.458 grains; the capacities of the measures are therefore as follows: Imperial Gallon = 277.274 Cubic Inches. " Quart = 69.3185         "

" Pint        = 34.65925 "

Fluid Ounce           =         1.73296 "

" Drachm        =          .21662 "

Thus it will be seen that there is a slight difference in weight between the English and United States unit of capacity, viz.: The cubic inch of water; the English being weighed at 62° Fahr., and the United States at 39.83°. (See No. 5935 (Avoirdupois Weight).)