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Directions for Using the Thermometer (Different ranges of liquors)

different ranges of liquors, and marked at the top as follows (see Fig. 2) : 25 A. (above) to 10 B. (below) 50 B. (below) to to 100 A. (above), 25 A. (above), 10 B. (below), distinctly indicating which column is to be used in testing the strength. The column on the left, 25 A. to 100 A., is divided at the ratio of 6 for each 20 degrees; the middle column, 10 B. to 25 A., at the ratio of 7, and the column at the right, 50 B to 10 B, at the ratio of 8.

Practical Use.-Note the number of per centages above or below P., at which the spirit under trial cuts the graduated stem, then, from the number of per cents thus cut, subtract as many degrees as the mercury stands above 60°, or add to the number cut on the stem as many degrees as the mercury stands below 60°, and thus will the true strength be ascertained.

Example. Suppose the hydrometer sinks to 32 on the stem, and the thermometer shows 6 above 60 on the left column, then 6 per cent is to be deducted from 32 (the indication on the hydrometer), leaving 26 above, which is the strength of the liquor; but should the temperature be 6 below the 60, the hydrometer being 32, then 6 per cent should be added, making the proof 38 above. Again, if the hydrometer stands at 32, and the thermometer shows 10 above 60 on the same column, that would indicate that the liquor was less than 25 above, then the middle column should be used, which would give 11 to be deducted, making the strength 21 per cent.

Suppose the spirit under examination cuts the stem at 35 above P., and the mercury stands at 7 above 60 on the left column (which is to be used for that strength), then