Fog detectors for controlling changeable-message signs.

Author(s)
Spear, E.D.
Year
Abstract

Three instruments that will continuously and automatically measure visibility, detect fog, or do both are described. The characteristics, visibility range, output signal, power, operating temperature, operating humidity, weight, base, and calibration, are compared.

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Publication

Library number
B 7334 (In: B 4229 S) /73.5/ IRRD 209200
Source

In: Highway Research Board HRB Special Report, No. 129, 1972, p. 220-23, 5 fig., 1 tab., 7 ref.

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