Philosophical transactions, Vol. L. Part II. For the year 1758. / Giving some account of the present undertakings, studies, and labours, of the ingenious, in many considerable parts of the world.

by Various; Royal Society

Example 2.

The rest remaining, let the difference of longitude be only 40°; then

Log. 2400´ (in 40°)	3.3802112
Constant log.	-4.1015105
	-1.4817217
Log. sin. 35°	-1.7585913
	S =	-1.2403130
	D (as before) =	-1.4536500
S - D (= log. tang. 31° 27´ ½)		-1.7866630