Gage, Alfred P. (Alfred Payson), 1836-1903 · Boston, London, Ginn · leaf 554
ining them will lie in the same vertical plane with the Pole Star; thestring will lie in the geographical meridian. Place a long magneticneedle over the string; the angle between the needle and the string is therequired declination. If great accuracy be required, allowance must bemade for the fact… … Fig. 417. of equal declination on the earths surface. The line of nodeclination or isogonic of 0° (Fig. 417) commences at the N.magnetic pole about lat. 70°, long. 96°, passes in a south-easterly direction across Lake Erie and Western Pennsyl-vania, and enters the Atlantic Ocean near the…
Physics
Internet Archive · Cornell University Library · Public Domain Mark 1.0. Free to use for anything.
