Page:Treatise on Soap Making.djvu/91

75 To use the above hydrometer, a glass or crystal cylender will be wanted, the depth of which ought to be fully the length of the hydrometer, and of a diameter sufficiently large to admit the same freely.

When the leys are to be tried, fill the cylender, and introduce therein the hydrometer: it will then be seen which division, or number, the hydrometer sinks to; consequently must exactly ascertain, without farther trouble, the strength of such leys.

A proper boiling ley for soft soap, ought to weigh about 10 or 11 drams, which makes a very good medium. Seven pounds ten ounces tallow, avoirdupois weight, is supposed equal to a wine gallon nearly; and pump water, the English gallon, should weigh about 8 lib. 2 oz. 10 dr. avoirdupois weight.

Upon these principles, we establish the proper standard weight for English leys to