112 



GEELMUYDEN. ASTRONOMICAL OBSERVATIONS. [NORW. POL. EXP. 



In order to obtain the longitude of the Winter Hut, which was most probable according to 

 the Lunar Distances and the observations taken the next year, it has been supposed that the 

 mean daily rate of I during the whole summer was 12 s fast. For the days April 813 the 

 gain is included in the change by stopping given above. Applying also the other changes, 

 the following table was formed, containing the computed error of I to Greenwich Mean Time 

 for the times of observation, exclusive of the meridian altitudes. The value for March 14 was 

 found by comparison with chronometer Hohwfl. 



The quantity d will in course of time include the accumulated errors of the assumed rate, 

 but the numbers obtained on putting z/ = may safely be employed for taking the coordinates 

 out of the ephemeris. 



Among the observations given in the following pages are included the readings of barometer 

 and thermometer, necessary for refraction. They were often noted some hours before or after 

 the astronomical observations, but the daily variation of temperature being slight, the difference 

 is of no importance. The expedition had two aneroid barometers; one by Hicks, giving English 

 inches, was used in the beginning, the other by Gary, giving millimeters, after May 15, 1895. A 

 series of comparisons with the normal barometer on board, made by Lieut. Scott-Hansen in 

 February, 1895, gave the following corrections: 



Correction to Hicks = 0.07 in. = 1.7 mm. 

 Correction to Gary = + 5.3 mm. 



On the arrival at Cape Flora in 18% the comparisons with Mr. Jackson's barometer gave 

 a somewhat greater correction to Gary, but the difference is of no importance for the present 

 purpose. Hicks had then a very large correction, probably owing to a shock on May 30, 1895. 



The uncorrected numbers are given in the following pages. 



Local Mean Time is abbreviated to LT. 



The point of departure on March 14 was N. Lat. 84 4' and E. Long. 101 33'; LT-I = 

 5h 57m 12, LT-II = 61i 7" 6; Magnetic Declination 42 E. During the first days the course 

 was set nearly due north, or sometimes a little easterly; even without this a deviation in that 



