There has long been a need for an instrumental method of measuring visibility conditions in the vicinity of lookout stations in order that forest administrators might know when the number of lookouts on duty should be increased and when this detection force might safely be reduced. Ocular estimates of visibility are inaccurate. An instrument known as a haze meter has recently been devised for use by lookouts to provide accurate information on visibility conditions. This instrument indicates in miles the maximum distance at which a standard size of fire can be detected under the conditions prevailing at the time of measurement.
Document Type: Journal Article
Pacific Northwest Forest Experiment Station
Publication date: April 1, 1935
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