Transactions of the Society of Arts Volume 8 (Paperback)

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1790 Excerpt: ...be at 320 of heat, and the weight N 3 sinks the instrument to letter S, on the stem, it shews the liquor to be thirteen gallons in the hundred under proof, concentration J, specific gravity 945. 300 of heat, and the instrument sinking to M, with weight N 4, shews fiftyseven gallons in the hundred under-proof, concentration nearly a gallon, specific gravity 976s. So of the rest. In ascertaining the strength or gravity of worts, the weight N 4 is always to continue on the Hydrometer; and the weights N I, 2, 3, are adapted to the sides, N= 1, 2, 3, of the square stem; which discovers the exact gravity of the worts. The instrument is adjusted so as to sink in rain water, at 603 of the thermometer, with the weight N 1, to W, on the side of the stem N 1, and mews to 260 heavier than water. The side N 2, with its corresponding weight N 2, shews from 26 to 53 degrees; and the side N 3 ascertains from 53 to 81 degrees, or 401 pounds per barrel heavier than water; two degrees on the stem being a pound per barrel. Use Use of the Hydrometer in ascertaining the Gravity of two or more Worts. Rule. 'Multiply the gravity of each wort by its respective number of barrels, or gallons. Divide the sum of the products by the number of gallons, or barrels. The quotient will be the mean gravity required. Suppose First Wort, 30 barrels, at 6o gravity. Second Wort, 20 barrels, at-350 gravity. 6o 350 30 barrels 20 barrels 1800 700 700 50) 2500 ( 500 mean gravity required. 2500 -.. N. B. N. B. When the heat of the worts cannot be conveniently tried at 6o of the thermometer, the following little table will shew the number of divisions to be added for the heat. Although the above table may not be found philosophically true, yet it will not err a quarter of a pound per barrel...