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The Hydrometer

a liquor which corresponds to 50 de grees of Tralles' hydrometer at the temperature of 60 degrees Fah." Proof 90 spirit is, therefore, by law, of the alcoholic strength of 50 per cent by vol- 80 ume, having a specific gravity of 0.933, 70 or a mixture of equal quantities of ab- 60 solute alcohol at the specific gravity of 0.793, and distilled water at 60° Fah. 50 In other words, proof spirit is one-half pure water and half absolute alcohol. 40 To ascertain what strength any 30 liquor above proof by the Gendar hydrometer would be by the Tralles hy- 20 drometer, add 100 to the given proof 10 if above proof, or deduct if below proof, from 100 on the Gendar scale, and di- P. vide by 2. Say a liquor is at 40 above 10 P. on the Gendar scale, you then add 100, making 140, and divide by 2, which 20 will show 70 on the Tralles scale. If 30 below P. deduct the proof from 100 and divide the remainder by 2. Say a 40 liquor is 35 below P., consequently you have a remainder of 65, and divide the 65 by 2, which will show 324 on Tralles' 60 scale. Having ascertained the degree of strength of any liquor by volume on Tral- 70 les' scale above 50 (which is proof), mul- 80 tiply the degrees by 2, and cut off the 50 two right hand figures, and it will show 30 the degrees above proof on Gendar's 100. scale. Thus we will suppose the spirit to