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U.S Navy Pelorus 1942 Compass
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U.S Navy Pelorus 1942 Compass
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This is fine relic and outstanding 1942 U.S. Navy Pelorus compass. This navigation instrument is used to take relative bearings of terrestrial objects in determining a vessels position. There are two sighting vanes which are aimed at a terrestrial object with the bearing read off the compass card. these bearings are compared to the vessel's compass heading which then give the magnetic bearing to the object. Bearings of two objects, taken sequentially, will fix the vessel's position. Similar observations of a rising or setting sun when on the prime vertical allow for determining compass error. A third arm, with a polished black glass reflector, allows similar sights to be taken of celestial bodies when on the horizon. The instrument consists of a compass rose with North in the form of a Flur De Lis as the zero indicator with the cardinal points having directional coordinates "lettered as N,S,E,W" that are further subdivided by diamonds shaped markings which further divides the circle into NE,SE,SW,NW. The outside ring is in the customary Navy increments of one degree, with a notation each ten degrees. The glass compass rose is set inside a bronze ring on gimbals and is weighted so that it remains level during the ships movements. Originally, it would have been mounted on the vessel's conning tower or bridge wings or housed in a case. The word Pelorus comes from the name of the guide who directed Hannibal's army from Cathage to Rome 218 B.C. DIMENSIONS PELORUS: Diameter of outer ring 10 1/4" Diameter of compass card 7 1/2" Height on stand 13" Approximate weight 30lb Bureau of ships U.S. Navy Standard Pelorus 7 1/2 inch illuminated dial mark 111 Mod. 0 Ser.N 5173 contract no.2325-1942 W.M. Welch Manufacturing CO. Chicago
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