Page:A Voyage of Discovery and Research in the Southern and Antarctic Regions Vol 1.djvu/410

1841

Observations of the Dip and Variation, made on board H.M.S. Erebus, between the 18th of March and 6th of April, 1841.

Date.	Position.		Dip S.	Variation.	Remarks.
	Lat. S.	Long. E.
	°⁠′	°⁠′	°⁠′	⁠°⁠′
Mar. 18	63.52	151.50	84.06	— 20.15	The sign — denotes easterly and + denotes westerly variation.
19	64.16	149.15	84.20	— 16.40
20	64.56	147.14	85.03	—
	65.15	144.53	85.05	—
	65.04	142.46	—	— 12.37
21	64.26	140.46	84.55	—  6.57
22	63.20	139.43	84.05	—  5.58
	62.42	138.20	84.00	—  4.05
23	62.20	136.26	83.45	—  1.12
	62.06	136.07	83.30	—  0.27
					Cross line of no variation.
25	60.23	131.38	83.10	+  8.09
26	59.10	130.00	82.36	+  8.32
28	57.20	127.49	81.45	+  8.47
29	56.16	130.46	81.00	+  5.46
30	55.10	131.30	80.20	+  1.34
	55.07	132.40	80.00	+  1.05
					Re-cross line of no variation.
31	54.05	134.30	79.30	—  1.44
Apr. 1	52.56	135.24	78.50	—  1.03	Anomalous observation.
2	51.12	136.55	77.40	—  4.39
5	44.52	143.38	73.20	—  6.00
6	44.06	145.42	71.40	— 10.06

The above table of Magnetic Observations is inserted here to show how rapidly the easterly variation diminished, until we crossed the line of no variation during the night of the 23d, in latitude 62º 0′ S., and longitude 135° 50′ E.; thence how quickly the westerly variation increased until the 28th, when in lat. 57° 20′ and long. 127° 49′ E., it amounted to 8° 47′ W.; and again, how regularly it dimi-