Gage, Alfred P. (Alfred Payson), 1836-1903 · Boston, London, Ginn · leaf 553
not coincide with the geographical poles,it follows that the needle does not in most places point duenorth and south. The angle which the vertical plane throughthe axis of a freely suspended needle makes with thegeographical meridian of the place is known as the angle ofdeclination. In other words… … ISOGONIC CtJEVES. 533 Experiment Jf. — We can easily find, as did Columbus, the declinationat any place by the following method : Set up two sticks so that a stringjoining them will lie in the same vertical plane with the Pole Star; thestring will lie in the geographical meridian. Place a long…
Physics
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