A Visibility Meter for Forest Fire Lookouts

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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

Affiliations: Pacific Northwest Forest Experiment Station

Publication date: April 1, 1935

More about this publication?
  • The Journal of Forestry is the most widely circulated scholarly forestry journal in the world. In print since 1902, the Journal has received several national awards for excellence. The mission of the Journal of Forestry is to advance the profession of forestry by keeping forest management professionals informed about significant developments and ideas in the many facets of forestry: economics, education and communication, entomology and pathology, fire, forest ecology, geospatial technologies, history, international forestry, measurements, policy, recreation, silviculture, social sciences, soils and hydrology, urban and community forestry, utilization and engineering, and wildlife management. The Journal is published bimonthly: January, March, May, July, September, and November.
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