TABLE OF CONTENTS. 



Values of a, b, c, and d, for the Admiralty Standard and After Azimuth 



Compasses ....■••• 209 



General equations for the determination of the deviations of the Admiralty 



Standard Compass . . . • • ■ .210 



General equations for the determination of the deviations of the After Azi- 

 muth Compass . . . ■ • ■ ■ .211 



Variations of the hard iron force, during the cruise, at the Admiralty Stand- 

 ard and After Azimuth Compasses . . ■ • ■ 211 



Computation of the coefficients A v B v C v D v E v for each compass, at 

 places where the deviations were observed on less than thirty-two points 211 



Recapitulation of results . . . . . ■ .219 



Final conclusions ........ 220 



ARTICLE V. Converging Series expressing the Ratio between the Diameter and 

 the Circumference of a Circle. By William Ferrel. Accepted for 

 publication April, 18T0. Published April, 1871. 4to. pp. 6. 



