Cowie's Printer's Pocket-Book and Manual/Physical Signs and Abbreviations
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PHYSICAL SIGNS AND ABBREVIATIONS.
| ℞ Stands for Recipe, or Take |
| ā aa, of each a like quantity |
| ℔ a pound |
| ℥ an ounce |
| ʒ a drachm |
| ℈ a scruple |
| j stands for one; ij for 2; and so on |
| ß signifies semi, or half |
| gr. denotes a grain
|
| One pound makes 12 ounces |
| One ounce contains 8 drachms |
| One drachm is equal to 3 scruples |
| One scruple consists of 20 grains |
| One grain has the weight of a barley-corn |
| P. stands for particula, a little part, and means so much as can be taken betwixt the ends of two fingers |
| P. æq. stands for partes æquales, or equal parts |
| q. s. quantum sufficit, or as much as is sufficient |
| q. p. quantum placit, or as much as you please |
| s. a. secundem artem, or according to art. |