GOOD-BY TO MARVIN
Up to this time no observations had been taken. The altitude of the sun had been so low as to make observations unreliable. Moreover, we were traveling at a good clip, and the mean estimate of Bartlett, Marvin, and myself, based on our previous ice experience, was sufficient for dead reckoning. Now, a clear, calm day, with the temperature not lower than minus forty, made a checking of our dead reckoning seem desirable. So I had the Eskimos build a wind shelter of snow, in order that Marvin might take a meridian altitude for latitude. I intended that Marvin should take all the observations up to his farthest, and Bartlett all beyond that to his farthest. This was partly to save my eyes, but principally to have independent observations with which to check our advance.
The mercury of the artificial horizon was thoroughly warmed in the igloo; a semi-circular wind-guard of snow blocks two tiers high was put up, opening to the south; a musk-ox skin was laid upon the snow inside this; my special instrument box was placed at the south end and firmly bedded into the snow in a level position; the artificial horizon trough, especially devised for this kind of work, was placed on top and the mercury poured into it until it was even full, when it was covered with the glass horizon roof.
MARVIN TAKING AN OBSERVATION IN A SNOW SHELTER
Marvin, then lying full length upon his face, with his head to the south and both elbows resting upon the snow, was able to hold the sextant steady enough to get his contact of the sun's limb in the very narrow strip of the artificial horizon which was available. A pencil and open note-book under the right hand offered the means of noting the altitudes as they were obtained.
The result of Marvin's observations gave our position as approximately 85° 48´ north latitude, figuring the correction for refraction only to a temperature of minus 10 F., the lowest temperature for which we had tables. It was from this point that, reckoning twenty-five miles for our last two marches, we calculated the position of Camp 19, where Borup turned back, as being 85° 23´, as against our respective dead reckoning estimates of 85° 20´, 85° 25´, and 85° 30´. This observation showed that we had thus far averaged eleven and a half minutes of latitude made good for each actual march. Included in these marches had been four short ones resulting from causes the recurrence of which I believed I could prevent in future. I was confident that if we were not interrupted by open water, against which no calculations and no power of man can prevail, we could steadily increase this average from this time on.
The next march was made in a temperature of minus thirty and a misty atmosphere which was evidently caused by open water in the neighborhood. About five miles from camp we just succeeded by the liveliest work in getting four of our five sledges across an opening lead. Getting the last sledge over caused a delay of a few hours, as we had to cut an ice raft with pickaxes to ferry the sledge, dogs, and Eskimo driver across. This impromptu ferry-boat was cut on our side and was moved across the lead by means of two coils of rope fastened together and stretching from side to side. When the cake was ready, two of my Eskimos got on it, we threw the line across to the Eskimo on the other side, the Eskimos on the ice raft took hold of the rope, the Eskimos on either shore held the ends, and the raft was pulled over. Then the dogs and sledge and the three Eskimos took their place on the ice cake, and we hauled them over to our side. While we were engaged in this business we saw a seal disporting himself in the open water of the lead.
At the end of the next march, which was about fifteen miles, and which put us across the 86th parallel, we reached Bartlett's next camp, where we found Henson and his party in their igloo. I got them out and under way at once, sending by one of them a brief note of encouragement to Bartlett, telling him that his last camp was beyond 86°, that he would probably sleep that night beyond the Norwegian record, and urging him to speed us up for all he was worth.