fire-finder alidade

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Osborne Fire Finder — An Osborne Fire Finder device used in fire lookout towers. The Osborne Fire Finder is a type of alidade used by fire lookouts in order to find a directional bearing (azimuth) to smoke in order to alert fire crews to a wildland fire. Contents … Wikipedia
Alidade — An alidade (archaic forms include alhidade, alhidad, alidad) is a device that allows one to sight a distant object and use the line of sight to perform a task. This task can be, for example, to draw a line on a plane table in the direction of the … Wikipedia

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