18 



RECORD AND RESULTS OF 



Pocket chronometer. 



31^ 56" 58=. 8 



3 59 05.5 



4 01 14.2 



Chronometer comparisons, April lOtli, 1861, at Port Foulke. 



Chronometers. a J" Port Foulke. PotFonlkp 



2001 : 8" 36" —4" 47"" 54^6 3" 48" 05=. 4 



1062: 8 40 —4 49 4Y.G 3 50 12.4 



140: 8 44 —4 51 39.1 3 52 20.9 



Mean 



43" of 200t = 8'' 44™ 53' of 1062 

 45 of 2001 = 8 48 44.5 of 140 



6 jP of pocket chronometer = ■ 



■ 4=.2 



A T Pocket chron'r 



on Port Foulke time. 



—8" 53=. 4 



—8 53.1 



—8 53.3 



—8 53 3 



Cairn Point, Smith Strait. 

 Observations for latitude of Cairn Point, April 12th, 1861. 

 Meridian altitude of the sun. S. J. McCormick, observer. 

 20 



T= — 50 



13 = 2 9'". 90 at 66° 



40° 13' 0' 

 Index correction + 2 



Altitude . . . 

 Refraction — par. — 

 Semidiameter . + 



Max. alt. . . . 

 a at appa't noon 



4. 18 30 42 



20 



01 30 





2 50 





15 59 



20 



20 39 



8 



51 23 



Approximate longitude 4'' 51g-" vpest of Greenwich. 



Latitude of Cairn Point. 



Observations for latitude of Cairn Point, April 15th, 1861. 

 Meridian altitude of the sun. S. J. McCormick, observer. 

 20 

 42° 22' 0" T = — 10° 

 Index correction + 2 B= 30^21 at 56° 



Altitude ... 21 12 00 

 Refraction — par. — 2 44 



Semidiameter . + 15 59 



Max. alt. ... 21 25 15 

 S at appa't noon 9 56 11 



$ 78 30 56 Latitude of Cairn Point. 



The difference between the maximum altitude and the meridian altitude, owing 

 to the change in the sun's declination, amounts in the present case to 0".5, and 

 may therefore be neglected. 



Taking the mean value of ^ we find the latitude of Cairn Point, 78° 30' 49" 



Observations for time and longitude of Cairn Point, April 15, 1861. 



Double altitudes of the sun. S. J. McCormick, observer. 



T= — 10° 

 B = 30M9 at 55° 

 Index correction + 2' 0" 

 Semidiameter = 15' 58'' 



J t E hT 



+ 90 59' 03" I 50O 41' 04" | —0= | — 1" 5P 

 Pocket chronometer, A r on Port Foulke time, — 8 49.1 



Longitude of Cairn Point, cast of Port Foulke, 58 . 



Pocket chronometer. 





20 



3" 29" 42' 



30 86 



31 09 



7- =3' 38" 





330 50 

 46 

 42 



^ = 8" 



T 



gh 30m 293 1 72° 



5 



3' 32" 1 



