Electricity and magnetism for advanced students (1920)
Starling, Sydney George, 1873- · London Longmans, Green · leaf 38
nd,the difference between thetwo gives us the magnetic de-clination. The geographicalmeridian is found by observ-ing the image of the sun pro-duced by the mirror m inpassing the cross wire of thetelescope, it having been pre-viously adjusted so that itsaxis is horizontal, and theplane in which the… … 28 ELECTRICITY AND MAGNETISM chap. equation of time, the direction of the sun at the time of observation isknown, and thus the direction of true N and S also. The period of oscillation of the magnet may now be found with thearrangement just described. Tlie magnet is given a small oscillation,and…
Electricity · Magnetism
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