1. Published by permission of the Director of the Bureau of Standards of the U.S. Department of Commerce.
2. Savart, Ann. de Chim., 53, 337, 1833.
3. Magnus, Phil. Mag., 18, 161, 1859.
4. Plateau, “Statique experimentale et theorique des liquides soumis aux seules forces moleculaires,” Paris 1873. (Access to Plateau's original memoir has not been obtained. References and quotations are taken from Lord Rayleigh's papers.)
5. Boys, “Soap Bubbles,” p. 79, 1902.