34 



REPORT ON 



The Powhattan fired a salute, and, from the mean of seven observations, the 

 interval between the flash and report, noted at B, was 6.55 seconds. External 

 thermometer 86°. Hence the distance from B to D was 7526 feet. 



Distance from B to M= 200 feet. 



Azimuth from M to A = N. 75° 38' E. 



Angle AMB = 128° 57'. 



From these data we find the distances between the several points as follows : 



AD = is8i4feet. 

 AC = 21491 " 

 ^^ = 18826 " 



AM= 18702 " 

 Angle BAM=o° 28' 



C-E = 4355 feet - 

 ^C=33 5 8 " 

 BF = 2516 " 



B E = 1443 feet. 

 CZ>=79io " 

 C^ = 35 68 " 



Angle A MB = 128 57' 



Angle ABM=so° 35' 



Azimuth from Ttf to A = N. 75 ° 38' E. 

 " " i? to A = N. 76 6 E. 



Azimuth from B to E = S. 8° 43' E. 

 " BtoB = S. 43 26 W. 



Assuming the position of M to be 



Lat. 3 43' 59". o S. 



Long. 2 h 34 m 6 s . 00 W. 

 we get finally 



Station. 



Latitude. 



Longitude. 



B 



E 

 F 

 A 



3 43' 5 7"- 8 S. 

 3 44 12.0 

 ^ 44 15-9 

 3 43 J 3-3 



2 h 34 m g s TI w 



2 34 5-97 

 2 34 7-25 

 2 33 54-i° 



For convenience of reference the results of the observations contained in this 

 section, together with the chronometer comparisons made during the cruise, are 

 here collected and appended. 



Observed Latitudes. 



Name of station. 



Latitude. 



Fort Christian, St. Thomas ..... 



18 



20' 0' 



N. 



Isle Royal, Salute Islands ..... 



5 



17 29 



N. 



Magnetic Station, Ceara, Brazil .... 



3 



43 59 



S. 



Custom-house, " " . . . ' . 



3 



43 58 



S. 



Church of the Conception, Ceara, Brazil 



3 



44 12 



S. 



St. Joseph's Church, " " . 



3 



44 16 



s. 



Point Macoripie Light-house, " " . 



3 



43 13 



s. 



