Imágenes de páginas
PDF
EPUB
[graphic][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][ocr errors][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed]

U. S. Department of Commerce Charles Sawyer, Secretary

National Bureau of Standards E. U. Condon, Director

[merged small][merged small][merged small][graphic][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed][subsumed]

National Bureau of Standards Handbook 42

Issued September, 1949

For sale by the Superintendent of Documents, Washington 25, D.C. - Price 15 cents

[blocks in formation]
« AnteriorContinuar »