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 thirteen fields: electricity, optics and metrology, heat and power, atomic and radiation physics, chemistry, mechanics, organic and fibrous materials, metallurgy, mineral products, building technology, applied mathematics, electronics, and radio propagation. The Bureau has custody of the national standards of measure-ment and conducts research leading to the improvement of scientific and engineering standards and of techniques and methods of measurement. Testing methods and instruments are developed; phys-ical constants and properties of materials are determined; and technical processes are investigated. JOURNAL OF RESEARCH The Journal presents research papers by authorities in the specialized fields of physics, mathe-matics, chemistry, and engineering. Complete details of the work are presented, including labora-tory data, experimental procedures, and theoretical and mathematical analysis. Annual subscrip-tion: domestic, $5.50; foreign, $6.75