An inspection of the monthly means shows that the barometer at Cape Sheridan is lowest for the months of December and January, or about January 1st, and highest about April 1st, the range of the fluctuation being about 0.5 inch. These results agree well with those obtained by Greely at Fort Conger and illustrated by a diagram upon p. 166, Vol. II, of his Report.
From a tabulation made according to hours of the day, but not given here, there is seen to be a diurnal fluctuation at Cape Sheridan amounting to a little more than 1/100 of an inch. The minima of this fluctuation are fairly well defined from November to April and occur at about 2 o'clock both a.m. and p.m.
After leaving Etah, August 17, 1908, on the voyage northward until July 12, 1909, thermograms covering 5½ months and barograms covering nine months of this interval were obtained from self-recording instruments. These are records in addition to the direct hourly readings of the thermometer and barometer made by the tide observers and from which the above results have been deduced.
APPENDIX II
Facsimiles of Original Observations by Marvin, Bartlett, and Peary and of Original Certificates by Marvin and Bartlett, respectively, during the Sledge Journey to the Pole.
| I. | Marvin's Observations, March 22, 1909. |
| II. | Marvin's Observations, March 25, 1909. |
| III. | Certificate of Marvin as to the Position of the Expedition on March 25, 1909. |
| IV. | Bartlett's Observations, April 1, 1909. |
| V. | Certificate of Bartlett as to the Position of the Expedition April 1, 1909. |
| VI. | Peary's Observations April 6, 1909. |
[Note.—The originals were all made in pencil in notebooks. The engravings in line printed in this appendix are reproductions in slightly reduced size of tracings carefully made of the original manuscripts. The enclosing line in each case indicates the edges of the leaf on which the original work was written.
The size of this leaf is, with practical uniformity throughout the series, 4 x 6¾ inches. The facsimiles of Peary's observations of April 7, 1909, (q.v.) on pages 292 and 293 have been similarly made but are in the exact size of the originals. The Publishers.]