138 ESSAYS ano OBSERVATIONS 
The log. tan. of 25° 24'.504.47 is 9.6767070 
The log. of 79411 is 4.89 98807 
The fum is — 14+5755877 
The log. of 120589 is 5.0813077 
The difference 9.4.9 52800 
is the log. tang. of 17° 22’.210093 half the 
.difference of the angles CSD, CDS; there- 
' fore the angle CDS is 8° 2°.29354. A- 
gain, as the radius is to the fine of 9° 
10°.99106, fo is 57° .2957795s ee 
the number of degrees in an angle fub- 
tended by an arc equal to the radius 
to the number of degrees and minutes 
in an angle fubtended by an arc equal 
to the fine of 9° 10°.99106. 
The log. of 57.2957795 1s 167581226 
The log. fine of 9° 10°.99106 is 9.2030097 
The fumis °. ") -10,9611323 
The log. of rad. is 10.0000000 
he difference 0.9611323 
is the log. of 9° 87.6349999, the number 
of degrees.and minutes contained in an © 
angle fubtended by an arc equal to the 
fine, — 
