Compass Needle

Some articles on compass, compass needle, needle:

Using A Compass
... A magnetic compass points to magnetic north pole, which is approximately 1,000 miles from the true geographic North Pole ... A magnetic compass's user can determine true North by finding the magnetic north and then correcting for variation and deviation ... Deviation refers to the response of the compass to local magnetic fields caused by the presence of iron and electric currents one can partly compensate for these by careful location of the compass and the ...
Galvo - Types - Tangent Galvanometer - Theory
... At the center of the coil, where the compass needle is located, the coil's field is perpendicular to the plane of the coil ... These two perpendicular magnetic fields add vectorially, and the compass needle points along the direction of their resultant ... The current in the coil causes the compass needle to rotate by an angle From tangent law, i.e or or, where K is called the Reduction Factor of the ...
Galvo - Types - Tangent Galvanometer
... It works by using a compass needle to compare a magnetic field generated by the unknown current to the magnetic field of the Earth ... which states that the tangent of the angle a compass needle makes is proportional to the ratio of the strengths of the two perpendicular magnetic fields ... A compass box is mounted horizontally at the centre of a circular scale ...
Timeline Of Electromagnetic Theory - Modern History
... of the electrical properties of rubbed amber, he experimented with a needle balanced on a pivot, and found that the needle was non-directionally affected by many materials such as alum, arsenic, hard resin ... to explain problems in navigation due varying properties of the magnetic compass with respect to their location on the earth, such as magnetic declination and magnetic ... His experiments explained the dipping of the needle by the magnetic attraction of the earth, and were used to predict where the vertical dip would be found ...

Famous quotes containing the words needle and/or compass:

    And so the needle pricked her fingers;
    She fidgeted but didn’t go;
    A faint forgetfulness of reasons
    Kept her with him. Time is slow.
    Allen Tate (1899–1979)

    Histories of the world omitted China; if a Chinaman invented compass or movable type or gunpowder we promptly “forgot it” and named their European inventors. In short, we regarded China as a sort of different and quite inconsequential planet.
    —W.E.B. (William Edward Burghardt)