A theoretical analysis is made of the effect of antenna size on parameters such as gain, bandwidth, and efficiency. Both near-zone and far-zone directive gains are considered. It is found that the maximum gain obtainable from a broad-band antenna...
filament, air drag, transverse-wave front, strain wave
The effect of air drag on the motion of a filament struck transversely is treated theoretically. The air drag is shown to produce curvature in the transverse wave formed by the impact, to increase the speed of the transverse-wave front, and to...
This image is part of the Anechoic Chamber collection. The Sound Building, dedicated to the study of acoustic phenomena, featured a large anechoic chamber. It was begun in 1965 and occupied early in 1968. It achieved its quiet because it was lined...
Edward Wight Washburn (May 10, 1881 – Feb. 6, 1934). Washburn was Chief Chemist at the National Bureau of Standards from 1926-1934. Image was scanned for Hratch Semerjian, who is working on a NIST history book. Semerjian donated this photo to the...
Photographs; History; Metrology; Manuscripts; Conservation and restoration; Preservation and restoration; Laboratories
Edward U. Condon (left), Director of the National Bureau of Standards, Harold M. Alexander (center), Director of the Development Department of the Libbey-Owens-Ford Glass Company, and Luther H. Evans (right), Librarian of Congress, are inspecting...
Edward Uhler Condon (1902-1974) was Director of the National Bureau of Standards from 1945 to 1951. Image source: Edward U. Condon biographical file, NIST Archives.
Edward Uhler Condon (1902-1974) was Director of the National Bureau of Standards from 1945 to 1951. Image source: Edward U. Condon biographical file, NIST Archives.
Edward Uhler Condon (1902-1974) was Director of the National Bureau of Standards from 1945 to 1951. Image source: Edward U. Condon biographical file, NIST Archives.
Edward Uhler Condon (1902-1974) was Director of the National Bureau of Standards from 1945 to 1951. Image source: Edward U. Condon biographical file, NIST Archives.
Officials and employees; Public officers; Photographs; History; Metrology; 1950s
This image is part of the NBS-NIST Directors collection. The NBS-NIST Directors collection features photographs from the archives and photos of the official painted portraits of directors of the National Bureau of Standards (NBS) and National...
Officials and employees; Public officers; Photographs; History; Metrology
This image is part of the NBS-NIST Directors collection. The NBS-NIST Directors collection features photographs from the archives and photos of the official painted portraits of directors of the National Bureau of Standards (NBS) and National...