144 ESSAYS snp OBSERVATIONS | 
The log. tang. of 30, half the 
angle AC3, is 7.9408 534. » 
The difference of the logs. of 
AS, SP is 0.0806086 
The difference 78602408 
is the log. tang. of 24°.9196814, half the 
difference of the angles CSB, C85; there- 
fore, the angle CSB, that is, the angle ACD, 
is £4'.9196814; and the angle CBS, that 
is, the angle BCD, is 5.0803186., Again, 
to determine the angle CDS, 
The log. tang. of half the 
angle ACD is 7,8958249 
The difference of the logs. of 
AS, SP is 0.0806086 
The difference 7.91 52163 
is the log. tang. of 22°.4641426, half the 
difference of the angles CSD, CDS; there- 
fore the angle CDS, that is, theangle DCF, 
is 4'.995698I- 
Acatn, as the radius is to the fine of 
5’.0803186, fo is 57°.2997795, Ot. the 
number of degrees in an angle fubtended 
by an arc equal to the radius, to the 
number 
