Note 46 — A CYCLOPÆDIA OF PRACTICAL RECEIPTS, PROCESSES, AND COLLATERAL INFORMATION (continued 7)
Reading edition
Mr Griffin, in his ‘System of Ammonimetry,’ calls every 2121⁄2 gr. of anhydrous ammonia a TEST-ATOM; and every 7 water gr. measure, a SEPTEM. Thus, a gallon of water (= 10 lbs) contains 100,000 septems. The degrees of his AMMONIA-METER range from 1 to 100, and indicate the number of test-atoms of ammonia in one gal. of the liquid.