126 



REPORT ON 



Compass Courses. 



Deviation. 



A 



+ i?sin?' 



+ Ccos£' 



+ D and 2 £ 



+ E cos 2 f ' 



North 



«o 



A 





+ c 





+ E 



N. by E. 



«i 



A 



+ BS, 



+ cs, 



+ DS, 



+ ES 



N. N. E. 



S 2 



A 



+ B S 2 



+ CS 



+ DS 4 



+ ES, 



N. E. by N. 



S 3 



A 



+ BS 3 



+ c s 5 



+ D S c 



+ ES a 



N.'E. 



S 4 



A 



+ B S 4 



+ CS 4 



+ D 





N. E. by E. 



S 5 



A 



+ BS 5 



+ CS3 



+ DS 6 



-ES 2 



E. N. E. 



So 



A 



+ BS G 



+ cs 2 



+ DS, 



— ES 4 



E, by N. 



s, 



A 



+ BS, 



+ CS, 



+ DS, 



-ES 6 



East 



s 8 



A 



+ B 







— E 



E. by S. 



s 9 



A 



+ BS, 



— c s, 



— D S 2 



-ES 



E. S. E. 



Sio 



A 



+ BS 6 



-cs, 



— D S 4 



— ES, 



S. E. by E. 



8„ 



A 



+ B S 5 



-CS 3 



— DS 6 



-ES, 



S. E. 



*» 



A 



+ B S 4 



-cs, 



— D 





S. E. by S. 



*.s 



A 



+ BS 3 



— c s 5 



-DS 6 



+ ES 2 



S. S. E. 



*» 



A 



+ B S„ 



-cs, 



— DS 4 



+ ES 4 



S. by E. 



Sis 



A 



+ bs; 



-cs, 



— DS a 



+ ES 6 



South 



s 16 



A 





— c 





+ E 



S. by W. 



»17 



A 



— B S, 



-cs, 



+ DS 2 



+ ES 6 



S. S. W. 



Sis 



A 



-BS 2 



-cs 



+ DS 4 



+ ES, 



S. W. by S. 



s w 



A 



-BS, 



— c s 5 



+ DS ( 



+ E S 2 



S. W. 



S 2 o 



A 



— B S, 



— c s, 



+ D 





S. W. by W. 



s 21 



A 



— B S 5 



-cs, 



+ DS a 



— E S 2 



W. S. W 



s 22 



A 



-BS 



-cs 2 



+ DS ( 



— E S 4 



W. by S. 



S 2 3 



A 



-BS, 



-cs, 



+ DS 2 



-ES, 



West 



s 2i 



A 



— B 







— E 



W. by N. 



s 25 



A 



-BS, 



+ CS, 



— D S a 



-ES„ 



W. N. W. 



S 20 



A 



-BS 6 



+ cs a 



— DS, 



-ES, 



N. W. by W. 



s 27 



A 



— BS 5 



+ cs 3 



-DS 6 



— ES a 



N. W. 



s 23 



A 



-BS, 



+ c s 4 



— D 





N. W. by N. 



S 2 9 



A 



-BS 3 



+ cs. 



-DS 6 



+ ES 2 



N. N. W. 



S 3 o 



A 



— BS, 



+ cs G 



-DS, 



+ ES 4 



N. by W. 



S31 



A 



— B S, 



+ cs, 



— DS, 



+ ES, 



By the method of least squares we obtain, 

 the five normal equations 



«0 + Sl + S 3 



aiflx+3",;^ + «,#, + && 

 ^Sz + ^St + ^Se + Scc, 



from these 32 equations of condition, 



+ a 8 i = 32 4. 



=16 5. 



= 16 a 



=16 2). 



= 16 E. 



For convenience of computation these equations have been put under the form 



I 1 (^ ~f~ ^« 1^9 + $x\ 



+ »L— 2 I 2 / 



+i( 



2 



+ 



^10 + ^5 



