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An Osborne Fire Finder device used in fire lookout towers. The Osborne Fire Finder is a type of alidade used by fire lookouts to find a directional bearing ( azimuth ) to smoke in order to alert fire crews to a wildland fire .
This is a list of United States Army fire control, and sighting material by supply catalog designation, or Standard Nomenclature List (SNL) group "F".The United States Army Ordnance Corps Supply Catalog used an alpha-numeric nomenclature system from about the mid-1920s to about 1958.
A radio direction finder (RDF) is a device for finding the direction, or bearing, to a radio source. The act of measuring the direction is known as radio direction finding or sometimes simply direction finding (DF). Using two or more measurements from different locations, the location of an unknown transmitter can be determined; alternately ...
Range-Finding in the Army. How to use range-finders to get results: the erect and inverted types, Popular Science monthly, February 1919, page 118–120, Scanned by Google Books; Electro Optic Application Test Equipment, Berkeley Nucleonics Corporation, archived from the original on 2011-07-11
The more powerful models of rangefinders measure distance up to 40 km and are normally installed either on a tripod or directly on a vehicle, ship, jet, helicopter or gun platform. In the latter case the rangefinder module is integrated with on-board thermal, night vision and daytime observation equipment.
FH4 "Huff-duff" equipment on the museum ship HMS Belfast. High-frequency direction finding, usually known by its abbreviation HF/DF or nickname huff-duff, is a type of radio direction finder (RDF) introduced in World War II.