This content is only available as a PDF.

Footnotes

*Publication approved by the Director of the National Bureau of Standards of the U. S. Department of Commerce. This paper covers the formal part of an address by the senior author before the American Academy of Arts and Sciences, Boston, Oct. 13, 1937, on the occasion of the presentation to him of the Rumford Medals of the Academy.—Ed.

Article PDF first page preview

Article PDF first page preview