MONO91 Inside Back Cover inside back cover Mary Elizabeth Stevens National Bureau of Standards NBS TECHNICAL PUBLICATIONS PERIODICALS JOURNAL OF RESEARCH reports National Bureau of Standards research and development in physics, mathematics, chemistry, and engineering. Comprehensive scientific papers give complete details of the work, including laboratory data, experimental procedures, and theoretical and mathematical analy- ses. Illustrated with photographs, drawings, and charts. Published in three sections, available separately: * Physics and Chemistry Papers of interest primarily to scientists working in these fields. This section covers a broad range of physical and chemical research, with major emphasis on standards of physical measurement, fundamental constants, and properties of matter. Issued six times a year. Annual subscription: Domestic, $9.50; for- eign, $1 1.75*. * Mathematical Sciences Studies and compilations designed mainly for the mathematician and theoretical physicist. Topics in mathematical statistics, theory of experiment; design, numerical analysis, theoretical physics and chemis- try, logical design and programming of computers and computer systems. Short numerical tables. Issued quarterly. Annual subscription: Domestic, $5.00; foreign, $6.25*. * Engineering and Instrumentation Reporting results of interest chiefly to the engineer and the applied scientist. This section includes many of the new developments in instrumentation resulting from the Bureau's work in physical measurement, data processing, and development of test methods. It will also cover some of the work in acoustics, applied mechanics, building research, and cryogenic engineering. Issued quarterly. Annual subscription: Domestic, $5.00; foreign, $6.25*. TECHNICAL NEWS BULLETIN The best single source of information concerning the Bureau's research, developmental, cooperative and publication activities, this monthly publication is designed for the industry-oriented individual whose daily work involves intimate contact with science and technology-for engineers, chem'sts, physicists, re- search managers, product-development managers, and company executives. Annual subscription: Domestic, $3.00; foreign, $4.00*. * Difference in price is due to extra cost of foreign mailing. NONPERIODICALS Applied Mathematics Series. Mathematical tables, manuals, and studies. Building Science Series. Research results, test methods, and performance criteria of building ma- terials, components, systems, and structures. Handbooks. Recommended codes of engineering and industrial practice (including safety codes) de- veloped in cooperation with interested industries, professional organizations, and regulatory bodies. Special Publications. Proceedings of NBS confer- ences, bibliographies, annual reports, wall charts, pamphlets, etc. Monographs. Major contributions to the technical literature on various subjects related to the Bureau's scientific and technical activities. National Standard Reference Data Series. NSRDS provides quantitive data on the physical and chemical properties of materials, compiled from the world's literature and critically evaluated. Product Standards. Provide requirements for sizes, types, quality and methods for testing various indus- trial products. These standards are developed coopera- tively with interested Government and industry groups and provide the basis for common understanding of product characteristics for both buyers and sellers. Their use is voluntary. Technical Notes. This series consists of communi- cations and reports (covering both other agency and NBS-sponsored work) of limited or transitory interest. Federal Information Processing Standards Pub- lications. This series is the official publication within the Federal Government for information on standards adopted and promulgated under the Public Law 89-306, and Bureau of the Budget Circular A-86 entitled, Standardization of Data Elements and Codes in Data Systems. CLEARINGHOUSE The Clearinghouse for Federal Scientific and Technical Information, operated by NBS, supplies unclassified information related to Government-gen- erated science and technology in defense, space, atomic energy, and other national programs. For further information on Clearinghouse services, write: Clearinghouse U.S. Department of Commerce Springfield, Virginia 22151 Order NBS p[OCRerr]ublications from: Superintendent of Documents Government Ptinting Office Washington, D.C. 20402