f26 ESSAYS AND OBSERVATIONS 



log.' tang, of 20° 49'. 00894 half the difference 

 of the. angles CSB, CBS j therefore the an- 

 gle'CSB orACD is 50° 49'.oo894, and the 

 angle CBS or BCD is 9° io'.99io6. Again, 

 in the triangle DCS, as 120589 the fum of 

 DC, CS,' is:;.to.794ii the difference of DC, 

 CS, {q is;: the -^tangent of 25° 24^50447 half 

 the fum of the angles CSD, CDS, to the tan- 

 gent of half the difference of the angles 

 CSD, CDS. 



The log. taTig;i!)f25° 24'.50447 is 9.6767070 

 The log. of 7941 1 is 4.8998807 



The Cyim is 14.5765877, 



The log.;oCj.20589 is 5.0813077 



The difference 9.4952800 



is- the log. tarrg. of 17°^ 22'.2i093 hdf thedif-- 

 ference of the angles CSD, CDS 5 therefore 

 the angle CDS is S° 2'.29354. Again, as the 

 radius is to the fine of 9° io'.99io6, fo is 

 57° .2957795. £><:. the number of degrees 

 in an angle fubteixded by an arc equal 

 to the radius, to the number of degrees and 

 minutes in an angle fubtended by an arc equs,! 

 to the fine of 9° io'.99io6.. 



The 



