Method of determining operating condition of city street lightin

Details Method of determining operating condition of city street lightin Method of determining operating condition of city street lightin

1974-06-13

1976-08-17

Corbin, John K.

Optics: measuring and testing

Refraction testing

Prism engaging specimen

240 25, 240 4138A, 350168, G01B 1100

Patent

active

039751015

ABSTRACT:
Method for visually checking the lighted condition of a plurality of ground light sources, such as municipal street lighting, by taking a night aerial photograph of an optimum area when all ground lighting in the area is known to be functional, and using such photograph as a master reference for subsequent night aerial photographs of the same area by comparison means. Apparatus is disclosed for upwardly directing a component of each ground light, and altering the quality of such component in order to distinguish.

REFERENCES:
Light and Lighting, vol. 59, No. 5, May, 1966, p. XIII.
Ives, H. E., Airplane Photography, J. B. Lippincott Co., Philadelphia & London, 1920, pp. 291 and 295.

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