AbstractGet full access to this articleView all access options for this article.Get accessReferences1.Gardner, H. A., Davis, B. F., and Davis, C. H., Scientific Section, National Paint, Varnish, and Lacquer Association, Incorporated, Circular No. 534, 1937.2. Coblentz, W.W. , Bull. of the Bureau of Standards 9, 15 ( 1913); 11, 136 (1914).