Avoirdupois weight

The avoirdupois system is also an old system used by the pharmacist, in the past, for ordering bulk chemicals. Since this system is no longer used, practice problems on this topic will not be provided. However, for reference considerations, the following conversions of avoirdupois weights are provided ... 

In the United States, troy weight is used to measure gold and silver and avoirdupois weight is used for most other things. Given that... 

Sjnrap of Phosphate of Zinc. Pho f(phato of zinc, 192 grains water, 11 fluid drachms sjruny phosphoric acid (specific gravity 1.5), 5 fluid drachms syrup, 10 fluid ounces. Rub the phosphate with the water, add the acid, and filter into the syrup. Each fluid drachm contains 2 grains of zinc phosphate and about Id minims of dilute phosphoric acid. In this formula, avoirdupois weight and Imperial measure are adopted. 

In this formula avoirdupois weight and Imperial measure are adopted. 

As thus prepared, it contains the same proportion of iron, about 2 minims less of the dilute acid (25 instead of 27), and rather more sugar than when prepared according to the British Pharmacopeia. The phosphate of iron is made by the Br. Ph. process, and dried at a temperature not exceeding 100< P ldir. The specimens found in the ordinary course of trade are not readily soluble in the acid. This want of solubility is believed to be duo to the length of time they have been kept before sale, as the best resmts have been obtained with the phosphate only a few days old. In this formula avoirdupois weight and Imperial measure are adopted. 

Table for Convertinff Troy into Avoirdupois Weight. 

Avoirdupois Weight compared with Apothecaries Measure.. 5037 Avoirdupois Weight com uired with Apothecaries Weight-.5938 Avoirdujmis Weight compared... 

One pound of powder. Avoirdupois weight, will load 140 fifty-grain cartridges 93 seventy-five-grain cartridges 70 one-hundred-grain cartridges. 

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