532 



EXPEDITION TO POINT BARROW, ALASKA. 



Table o//m/"<w// of the aurora as observed at Uglaamie, Alaska^ beticeen October -, 1881, and Auymt, 1883. 



[The hours are loral uiwm time hours ut I'^Iaaniio. and tho numbers inrtirato the number of days in eaHi month -when aiiror;i* ^ i i. s m ut 

 each of tho hours indicated : Observations began October 17, 1881 ; eud, August 27, 1883. The presence or abseuce of an uurofii was noted 

 * few minutes before each fall hoar.] 



The total number of days when auroras were visible in the first 10i mouths (18S1-'S2), was 

 145, hence the average duration, 5J hours nearly : total number of days when auroras were seen 

 in the year ending August, 1883, was 169, hence the average duration, 7 hours nearly. 



In the tabulation and preparation of the manuscript record for the printer I had the assistance 

 of Sergeaut J. E. Maxfleld and Private G. W. Knopf, who performed their task with much zeal and 

 commendable industry ; they have also prepared a complete duplicate of the records of the report. 



PART IV. SEMI-MONTHLY TERM-DAY AND TERM-HOUR OBSERVATIONS. 



OBSERVATIONS OF THE fARIATION IN DECLINATION, IN HORIZONTAL AND IN VERTICAL FORCE. 

 HEADINGS OF THE DECLINOMETER ON TERM DAYS AT UGLAAM1E, ALASKA, SEPTEMBER 15, 1682, 

 TO AUGUST 15, 1883. 



[For scale values and other information see preceding part, III. Gottin^en time is employed.] 



Term-day readings of the Brooke declinometer, September 15, 1882. 



