Computer Science
Scientific paper
Dec 1951
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1951natur.168.1038b&link_type=abstract
Nature, Volume 168, Issue 4285, pp. 1038-1039 (1951).
Computer Science
1
Scientific paper
IT is sometimes desired to illuminate an object in an optical system at one level for general examination and at a momentarily higher level for photographic recording. The development of a combined flash and continuous source lamp offers a novel method for doing this. The high-pressure mercury-vapour compact-source lamp, the characteristic high brightness of which is well known, has successfully been used under pulse conditions to provide high levels of illumination for high-speed ciné photography1,2; this type of lamp has also been used as a condenser flash-discharge source to give high-intensity short-duration flashes of light. Recently a small xenon discharge lamp has been developed which provides a useful amount of light for such purposes as photo-micrography, and can, in addition, be switched at will from the steady arc to a condenser flash-discharge with a flash duration of less than 50 microsec. The xenon discharge gives excellent colour rendering under both conditions of operation.
Beeson J. G. E.
Webb Adrian
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