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X. ObferVations upon the Variation of the Needle 
made in the Baltick, Anno 1710. By A/r. 
William Sanderfon. Communicated by Capt. 
Soame. 
W EdmJday t June the Firft 1 720, being at An- 
chor near Revolt, in the Latitude of 58° 58' 
North , the Magnetical Amplitude at Sun-Set was 
Weft 64° 30' North. 
And the True was Weft 49 3 7 North. 
Variation North 14 53 Weft. 
Saturday , Julyz], at the 1 (\g Gottf and, in the Latitude 
of 58° 21' North, at SunSet, tne Magnetical Ampli- 
tude was Weft - 49° 50' North, and the 
True Amplitude, Weft 35* 00 North , which 
gives the Variation North 14 50 Weft. 
The Difference of Longitudes of the two forefaid 
Places by Dead Reck . is 1° 50'. 
October the 24th at Bornholme , in the Latitude of 
56° 00', at Sun Rifing, the Magnetical Amplitude was 
Eofi 43 0 15' South, and the True was 
Eaft 18 31 which gives the Variation 
North 14 44 Weft . 
Xf. Art 
