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2. Compass - Wikipedia

   en.wikipedia.org/wiki/Compass

   A modern military compass, with included sight device for aligning. A compass is a device that shows the cardinal directions used for navigation and geographic orientation. It commonly consists of a magnetized needle or other element, such as a compass card or compass rose, which can pivot to align itself with magnetic north.

3. History of the compass - Wikipedia

   en.wikipedia.org/wiki/History_of_the_compass

   The dry mariner's compass consists of three elements: A freely pivoting needle on a pin enclosed in a little box with a glass cover and a wind rose, whereby "the wind rose or compass card is attached to a magnetized needle in such a manner that when placed on a pivot in a box fastened in line with the keel of the ship the card would turn as the ...

4. Arago's rotations - Wikipedia

   en.wikipedia.org/wiki/Arago's_rotations

   Arago's rotations is an observable magnetic phenomenon that involves the interactions between a magnetized needle and a moving metal disk. The effect was discovered by François Arago in 1824. At the time of their discovery, Arago's rotations were surprising effects that were difficult to explain.

5. Binnacle - Wikipedia

   en.wikipedia.org/wiki/Binnacle

   Binnacle with iron correcting spheres at each side and clinometer below compass Modern binnacle with compass A binnacle ( / ˈ b ɪ n ə k əl / ) is a waist-high case or stand on the deck of a ship , generally mounted in front of the helmsman , in which navigational instruments are placed for easy and quick reference as well as to protect the ...

6. Magnetic deviation - Wikipedia

   en.wikipedia.org/wiki/Magnetic_deviation

   A sample compass correction card, showing the deviation correction for a given heading. Once the compass has been corrected using small magnets fitted in the base and with soft iron balls, any residual deviation is recorded as a table or graph: the compass correction card, which is kept on board near the compass. [6]

7. Local attraction - Wikipedia

   en.wikipedia.org/wiki/Local_attraction

   The sources of local attraction may be natural or artificial. Natural sources include iron ores or magnetic rocks while as artificial sources consist of steel structures, iron pipes, current carrying conductors. The iron made surveying instruments such as metric chains, ranging rods and arrows should also be kept at a safe distance apart from ...

8. AOL Mail

   mail.aol.com

   Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

9. Versorium - Wikipedia

   en.wikipedia.org/wiki/Versorium

   The needle turns to point at a nearby charged object due to charges induced in the ends of the needle by the external charge, through electrostatic induction.For example, if a positively charged object is brought near, the mobile negative charges in the metal will be attracted to it, and move to the end of the needle nearest the object.