Visual Range: Concepts, Instrumental Determination, and Aviation Applications Page: iii
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This document is a review of the principles, procedures, and
instruments used in the measurement of visual range. The fundamental
concepts of the visual range of objects and lights are discussed.
The principles of operation of the several classes of atmospheric
attenuation meters are reviewed and representative instruments are
described. The course of development of the NBS transmissometer, its
validation and application to aviation operations is reported. An
error analysis is made of the effects of instrument errors and of
differences in observer thresholds on visibility measurements. A
chronological review of the development and application of the runway
visual range concept is included together with a discussion of cloud
KEY WORDS: Ceilometer, runway visual range, scattering, transmissometer,
visibility, visual range.
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Douglas, C. A. & Booker, R. L. Visual Range: Concepts, Instrumental Determination, and Aviation Applications, report, June 1977; Washington D.C.. (digital.library.unt.edu/ark:/67531/metadc13191/m1/4/: accessed October 15, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.