A laboratory course in experimental physics (1896)
Loudon, W. J. (William James), McLennan, John Cunningham, joint author · New York and London, Macmillan and Co. · leaf 203
lines of force aredefined with respect to the geographical meridian, and to thehorizontal plane through any point. The vertical plane passingthrough the axis of a freely-suspended horizontal magnet at restis called the magnetic meridian, and the angle between it andthe geographical meridian, the… … ^ wwavcuw^ «.. - -— Fig. 4. THE DECLINATION COMPASS. 189 direction, is to make an accurate determination of the declina-tion. This is found by means of an instrument called the declina-tion compass. It consists, as represented in Fig. 4, of a circularbrass or copper box AB, attached at right angles…
Physics
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