84 



RECORD AND RESULTS OF 



Observations of Magnetic declination, April 15, 1861. I. I. Hayes, observer. 

 Bearina; of the sun. 



(Pock.) chron'r correction A T April 15 

 Observed time of . 



Mean time of observation (14th) . 

 Equation of time E . . . . 



Hour angle t . . . . ■ 



8 = + 9° 55' 25" 



M= 10 10 34 



^ = _ 13 38 



4) Magnetic bearing, 262 15 





— Y™ 



5P 



11" 



15 



00 



23 



07 



09 





+ 1 



13 



-0 51 38 



Put <(/Jf=-iH_^ 



COS ' 



then tgA ■ 



OS t 



tg t cos M 



(By Wiirdmann's compass, counting from S. through E.) 



Magnetic decl'n, +111 23 



Recapitulation op Results. 



1861. 



Observed declination. 



Time. 



Approximate 



correction for diurnal 



variation. 



Dec'n. 



ipril 9 

 " 12 

 " 15 



+ 110° 18' 

 + 110 00 

 + 111 23 



4i P. M. 

 Noon 

 11 A. M. 



—25' 

 —28 

 22 



+ 109° 53' 

 + 109 32 

 + 111 01 



Mean 



+ 110 09 



Foggy Camp, Smith Sound. 



Observations for magnetic declination, May 13 (P.M.) 1861. I. I. Hayes, observer. 



Bearing of the sun.' 



P. chron'r A r= + 1" 19" 48= 

 Observed time IO 4 17 20 



Mean time of ob's, 5 37 08 

 E + 3 53 



t 5 41 01 



Magnetic bearing |0 — 10' 

 Magnetic declination, 



79° 55'. 5 

 4" 45" 52' 



O's 5=18° 33' 25" 



ir=76 09.3 



^ = 88 41.6 



164 14.0 



+ 107 04.4 or + 100° 53' when corrected for diurnal var'n. 



Camp Ha"wks, Smith Sound. 



(Two miles from Irving Island, Dobbin Bay.) 



Observations for magnetic declination, May 22 (P. M.) 1861. I. I. Hayes, observer. 



Bearing of the sun.'' 



P. chron'r a T = + l"" 14" 32' 

 Observed time 8 02 50 



Mean time of ob's, 9 17 

 E +3 



t 9 20 50 



Magnetic bearing (J) 

 Magnetic declination. 



^ = 790 43'. 7 

 X = 4'' 52"" 24' 



O's 5= 20033' 15' 



Jf= — 26 00.2 



^ = 142 09 



102 30.0 



+ 115 21.0 or + 115° 38' when corrected for diurnal var'n. 



* Another observation 0|. 168° 25' at i^ 15" 58' has been rejected. 



" Of the following observation I have made no further use : At 7'' 28" 45' angle between sun (f) 

 and East Cape, Irving Island, 76° 8', magnetic bearing of Cape 43° 15'. Computing from these 

 data we have azimuth of Cape 30° 10' east of north, and magnetic declination + 106° 35'. 



