This section is from the book "A Treatise On Beverages or The Complete Practical Bottler", by Charles Herman Sulz. Also available from Amazon: A Treatise On Beverages.
Oil of bitter almond, 1 ounce (or more if a stronger essence is desired); alcohol 95°, 8 ounces; water, 8 ounces.
Dissolve the oil in the alcohol, then add the water, mix; or if a mixture of alcohol or water is kept ready, dissolve the oil in the diluted alcohol. Less alcohol and proportionally more water can be used, as the oil is soluble in weak alcohol. Should the essence, on account of adulterations in the oil, be not clear, add an ounce of pumice, etc.; shake and filter.