ASTRONOMICAL AND GEODETIC OBSERVATIONS 



Altitudes of the sun, Juno 8th, 1861. S. J. McCormick, observer. 



17 



Chronometer 2007 Q 



7" 46" 23' 30° 42' 50" 



46 49 41 50 



47 16 41 00 



Ordinary refraction. 



T Z J 



7M6"49^3 I 590 07' 24" | +22° 54' 30" 



T = + 340 



B = 29'".69 at 49° 



Corrections as above. Scmidiameter 15' 47'' 



450 02' 59" 



E aT 



-1™ 14^0 I —4" 47" 51^3 



Altitudes of the sun, July 7th, 1861. S. J. McCormick, observer 



T = + 48° 



B = 29^64 at 58° 



Correction for index, dip, refraction, and parallax — 5' 07". 



Semidiameter 15' 46".2 



Chronometer 2007 









7" 59" 



59 



8 00 



' 05' 

 41 

 34 



30° 



4' 40" 

 2 30 

 30 



8'' OP 

 01 

 02 



17' 

 55 



45 



29° 







58' 40" 

 57 20 

 56 00 



T 



>jh 59m 



8 01 



16'. 7 

 59.0 



59° 

 59 



46' 47" 

 52 01 



+ 22° 32' 46" I 46° 58' 4" 

 + 22 32 45 I 47 30 50 



Mean 



E aT 



+ 4" 36'.4 I —4'- 47" 18'.0 

 + 4 36.5 I —4 47 19.2 



—4 47 18.6 



^h 58m 



50' 



29° 20' 50 



59 



30 



19 00 



8 00 



09 



17 00 



T 





S 



Altitudes of the sun, July 13th, 1801. S. J. McCormick, observer. 

 Chronometer 2007 Q 



T = + 43° 

 B = 30'°.09 at 57° 



Correction for index, dip, refraction, and parallax — 5' 09" 

 J t E aT 



7''59"29'.7 I 60° 30' 26" \ +21° 46' 03" | 46° 42' 56" | +5" 26=. 5 ] —4" 47" 11'. 5 



Omitting the result of May 29th, on account of uiiusual refraction, we have the 

 following chronometer corrections and rate : — 



Port Foulke. 

 1861. March 8 

 1861. June 7 

 1861. June 8 

 1861. July 7 

 1861. July 13 



The correction and rate of the pocket chronometer we obtain from the following 

 chronometer comparisons. The pocket chronometer had rim down March 18 and 

 was set approximately to mean local time March 22. 



Comparisons for the observations at Cairn Point. 

 Chronometer comparisons April 8th, 1861, at Port Foulke. 



Chronometer 2007 A 



iT 



—4" 47" 56'. 9 





—4 47 52.3") 

 —4 47 51.3 y 



+ 0'.6 





—4 47 18.6 7 



+ 1.12 



—4 47 11.5 1 





cket jhronometer. 



Chronometers. 



A r Port Foulke. 



Mean time 

 Port Foulke. 



A T Pocket chron'r 

 on Port Foulke time. 



1" 49" 59'. 2 



740: 6" 33" 



—4" 51" 20'. 6 



1" 41" 39'.4 



—8" 19'. 8 



1 51 36.5 



1062: 6 33 



—4 49 43.1 



1 43 16.9 



—3 19.6 



1 53 24.2 



2007: 6 33 



—4 47 55.1 



1 45 04.9 



Mean 



—8 19.3 





. —8 19.6 



6" 84" 12' of 2007 = 6" 36" of 1062 



6 36 of 2007 = 6 39 25".5 of 740 



3 May, 1865. 



