REFERENCES
1.
For example: W. Zobel: U.S. patent No. 2,555,387, June 5, 1951;
E. F. Flint: U.S. patent No. 2,300,251, October 27, 1942, assigned to Bausch & Lomb Optical Company, Rochester, New York;
2.
Obtained from Coating Products Inc., Englewood, New Jersey.
3.
General information on the shape acquired by thin membranes is given by C. V. Boys, Soap‐Bubbles (Dover Publications, New York, 1959).
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© 1961 The American Institute of Physics.
1961
The American Institute of Physics
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