Merchant, F. W. (Francis Walter), 1855-1937, Chant, Clarence Augustus, 1865-1956 · Toronto : Copp Clark · leaf 204
W. of truenorth, at Montreal, 15° 4 W., at ^yinnipeg, 14° 4 E., at Victoria, B.C.,24° 25 E., at Halifax, 21° 14 W. These values are su))ject to slow-changes. At London, in 1580, the declination was ll 17 E. Thisslowly decreased, until in 1657 it was 0° 0. After this it became westand increased… … Fig. 236.—Isogfonic Lines for Canada and the United States (January 1, 1010). The data for regions north of latitude 55° are verj- meagre and discordant; the regions west ofHudson Ba\ where recent determinations have been made show considerable local disturbance ;the lines north of latitude 70° are…
Physics
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