P.—No. 5.

Lat. 17° 29' — Co. Lat. 107° 29' Lat. 37° 48' = Co. Lat. 52° 12. Long. 149° 29' W. to Long. 122° 24' W. = * diff. Long. 13° 32' 30". idiff.Long.log. Sin. ... 9-3694987 Sin. 2 187389974 Sin Co. Lat 99794593 Sin. Co. Lat 98977123 2)38-6161690 19-3080845 19-3080845 Sin. | diff. Co. Lat. ... 96664622 96416223 Sin. 96034879 30° 2556" 97045966 Distance, 3,652 miles = 60° 51' 52"

Great Circle for Course. —Tahiti to San Francisco. (See Diagram No. 9.) 60° 5152" ... 9-9412572 0-0587428 0-0587428 27° 5' 9-6582842 9-6582842 52° 12' 98977123 ... 107° 29' ... 99794593 N. 24° 19' E. ... 96147393 S. 29° 49' W. ... 96964863 Course from Course from Tahiti to San Francisco. San Francisco to Tahiti. Lat. 17° 29' ... 9-4777 37° 48' ... 9-7874 Tang. 24° 19' ... 9-6550 29° 49' ... 97582 Diff. Long. 7° 44' ... 94327 19° 21' ... 95456 Long. 149° 29' W. 122° 24' 141° 45' W. 141° 45' W. Long of point where great Circle cuts the Equator. Sin. of course 29° 49' ... 9-6964863 Lat.; 52° 12' ... 9-8977123 From Equator to either place, 23° 08' ... 9-5941980

On Great Circle for Distance. —Swan Island to Cape Farewell. Swan Island ... Lat. 40° 44' S., Long. 148° 9' E. Cape Farewell, Lat. 40° 30' S., Long. 172° 42' E. Lat. 40° 44' = Co. Lat. 49° 16' and Lat. 40° 30' = Co. Lat. 49° 30. Long. 148° 9' to Long 172° 42' == i diff. Long. 12° 16' 30". ! diff. Long 9-3275715 Sin. 2 18-6551430 Co. Lat. Sin 9-8810455 Co. Lat. Sin 9-8795287 2)38-4157172 19-2078586 19-2078586 i diff. Co. Lat. Sin. ... 7-3088239 89° 1638" Tang. = 11-8990347 Sin. 99999654 9° 17' 17" 9-2078932 Distance, 1,114-5 miles = 18° 34' 34"

15

ON POSTAL COMMUNICATION.