At head of title: Office of the Publication Board, Department of Commerce.
Reproduced from typewritten copy.
"If publication of this report in part or in full is contemplated, the Office of the Publication Board and the author should be consulted."
"Note: the Publication Board, in approving and disseminating this report, hopes that it will be of direct benefit to U.S. science and industry. Interested parties should realize that some products and processes described may also be the subject of U.S. patents. Accordingly, it is recommended that the usual patent study be made before pursuing practical applications."
