Gray's supplement to the Pharmacopoeia : being a concise but comprehensive dispensatory and manual of facts and formulae, for the chemist and druggist and medical practitioner / by Theophilus Redwood.

  • Gray, Samuel Frederick, 1766-1828.
Date:
1848
Catalogue details

Licence: Public Domain Mark

Credit: Gray's supplement to the Pharmacopoeia : being a concise but comprehensive dispensatory and manual of facts and formulae, for the chemist and druggist and medical practitioner / by Theophilus Redwood. Source: Wellcome Collection.

Provider: This material has been provided by the Francis A. Countway Library of Medicine, through the Medical Heritage Library. The original may be consulted at the Francis A. Countway Library of Medicine, Harvard Medical School.

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    barometer being at 30 inches, is equal to two hundred and fifty-two grains and four hundred and fifty-eight thousandth parts of a grain, *' of which, as aforesaid, the imperial standard troy pound contains 5760; be it therefore enacted, that if at any time hereafter the said imperial standard troy pound shall be lost, or shall be in any manner destroyed, defaced, or otherwise injured, it shall and may be re- stored by making, under the direction of the Lord High Treasurer, or the Commissioners of his Majesty's Treasury of the United King- dom of Great Britain and Ireland, or any three of them for the time being, a new standard troy pound, bearing the same proportion to the weight of a cubic inch of distilled water, as the said standard pound hereby established bears to such cubic inch of water. And by a law passed in the year 1835, (5 & 6 Gulielmi IV. cap. 63,) the use of any other weights besides those above described, and the apothecaries' weight, is rendered illegal, and it is enacted, That from and after the passing of this act, all articles sold by weight shall be sold by avoirdupois weight, except gold, silver, platina, diamonds, or other precious stones, which may be sold by troy w^eight, and drugs, which, when sold by retail, may be sold by apothecaries' weight. The following, then, are the three kinds of weight now recognised by law in this country. AVOIRDUPOIS, OR IMPERIAL WEIGHT. Equivalents in Troy grains. 1 dram 27-34375 16= 1 ounce 437-5 256= 16= 1 pound 7000- 3584= 224= 14= 1 stone 98000- 28672= 1792= 112= 8= 1 hundred weight 784000- 473440=35840=2240=160=20=1 ton . . . 15680000- TROY WEIGHT. 1 grain. 24 = 1 pennyweight. 480 = 20 = 1 ounce. 5760 = 240 = 12 = 1 pound. apothecaries' weight. 1 grain. 20 = 1 scruple. 60 = 3=1 drachm. 480 = 24 = 8 = 1 ounce. 5760 = 288 = 96 = 12 = 1 pound. The apothecaries' weight is that alone the use of which is recognised by the colleges of physicians, in the preparation or dispensing of medicines, either according to the Pharmacopceia, or extemporaneous prescriptions. It is not, however, customary for pharmaceutical che-