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Lead, port and starboard or brass
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They are known as Kelvins Balls sometimes Flinders Balls which helps a magnetic compass in the correction of heel etc. to enable a calculation of Magnetic North (very short answer)
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I have heard them called the "navigator's balls" and you are never to mess with the navigator's balls. Much the same technique is used on the magnetic compass in aircraft. Except the magnets are much smaller and adjusted with brass screws and brass screwdrivers when they "swing the compass" on a compass rose somewhere on the airport grounds. http://forums.pelicanparts.com/uploa...1411154393.jpg |
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http://forums.pelicanparts.com/uploa...1411284939.jpg
in honor of the 1400th page, i found a Seat 1400, enjoy |
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On the tour of the LST 325
Piston (note the key ring for relative size) http://forums.pelicanparts.com/uploa...1411338951.jpg Fuel Injectors (note full size SLR camera case for relative size) : http://forums.pelicanparts.com/uploa...1411338820.jpg 1400 ft/lb torque wrench for engine work: http://forums.pelicanparts.com/uploa...1411338632.jpg http://forums.pelicanparts.com/uploa...1411338674.jpg |
The above mentioned Navigators balls have many slang names.
They are in Fact Quadrantal Spheres. They are only needed on steel Ships or boats to isolate a magnetic compass from the mag. field of the ship. |
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