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Calibration of Line Standards
of Length and Measuring Tapes
at the National Bureau of Standards
UNITED STATES DEPARTMENT OF COMMERCE
(S. NATIONAL BUREAU OF STANDARDS,
The National Bureau of Standards is engaged in fundamental and applied research in physics, chemistry mathematics, and engineering. Projects are conducted in fifteen fields: electricity and electronics, optio and metrology, heat and power, atomic and radiation physics, chemistry, mechanics, organic and fibrou materials, metallurgy, mineral products, building technology, applied mathematics, data processing sys tems, cryogenic engineering, radio propagation, and radio standards. The Bureau has custody of th national standards of measurement and conducts research leading to the improvement of scientific an engineering standards and of techniques and methods of measurement. Testing methods and instrument are developed; physical constants and properties of materials are determined; and technical processes ar investigated.
Journal of Research
The Journal presents research papers by authorities in the specialized fields of physics, mathematic chemistry, and engineering. Complete details of the work are presented, including laboratory data experimental procedures, and theoretical and mathematical analyses. Annual subscription: domesti $4.00; $1.25 additional for foreign mailing.
Technical News Bulletin
Summaries of current research at the National Bureau of Standards are published each month in th Technical News Bulletin. The articles are brief, with emphasis on the results of research, chosen on th basis of their scientific or technologic importance. Lists of all Bureau publications during the precedin month are given, including Research Papers, Handbooks, Applied Mathematics Series, Building Mat rials and Structures Reports, Miscellaneous Publications, and Circulars. Each issue contains 12 or mo two-column pages; illustrated. Annual subscription: domestic, $1.00; 35 cents additional for foreig mailing.
Basic Radio Propagation Predictions
The Predictions provide the information necessary for calculating the best frequencies for communic tion between any two points in the world at any time during the given month. The data are important all users of long-range radio communications and navigation, including broadcasting, airline, steamshi and wireless services, as well as to investigators of radio propagation and ionosphere. Each issue, cove ing a period of one month, is released three months in advance and contains 16 large pages, includi pertinent charts, drawings, and tables. Annual subscription: domestic, $1.00; 25 cents additional f foreign mailing.
CATALOGS OF NBS PUBLICATIONS
National Bureau of Standards Circular 460 and its Supplement lists all Bureau publications from 19 through June 1952, including Applied Mathematics Series, Building Materials and Structures Report Circulars, Handbooks, Research Papers, and Miscellaneous Publications. Brief abstracts for t publications issued after January 1, 1942, are also included.
National Bureau of Standards Circular 460, 375 pages, $1.25. Supplement to Circular 460, 223 page 75 cents. (A free mimeographed list of publications issued since June 1952 is available on request the National Bureau of Standards.)
Order all publications from the Superintendent of Documents
U. S. Government Printing Office, Washington 25, D. C.