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Directions for Using the Hydrometer

show 70 per cent strength on Tralles' scale. We, therefore, multiply 70 by 2, which gives us 140; we now cut off the two right hand figures thus, 1.40, and find that the liquor is 40 above proof, on Gendar's scale.

Or suppose a liquor is below 50 on Tralles' scale (which is below proof). To find what degree it is below proof on Gendar's scale: multiply the degrees on Tralles' scale by 2 and add a number sufficient to make 100; the number required to be added will show the degree below proof. For example, we will suppose the liquor to be 45 per cent on Tralles' scale, we multiply 45 by 2, this gives us 90, we then add 10 to make that number 100, and we thus ascertain that the liquor is 10 below proof on Gendar's scale. Nothing can be more simple than this. Annexed we give a diagram of Gendar's hydrometer, which represents it at about one-half its actual size. (See Fig. I.) Directions for using Gendar's Hydrometers.

P. on the stem of the hydrometer is the mark for proof, when the liquor is 60° Fah., at which temperature the instrument is graduated. Every line above the P. is one per cent above proof. Each line below the P. is one per cent below proof.

It will be observed that the hydrometer has a stationary weight on the stem, and is also furnished with a sliding weight. The latter is always required when the liquor to be tested is not more than 50 above proof, using the scale on the left side of the stem, which runs from 50 below to 50 above proof. When the liquor is stronger than 50 above proof, the sliding weight must be removed, and the scale at the other side of the stem used, this scale