APPENDIX I 349 



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 illus- 

 trated 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 y-ou- of an inch. The minima of this fluctu- 

 ation 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 

 5} months and barograms covering nine months of this 

 interval were obtained from self-recording instruments. 

 These are records in addition to the direct hourly read- 

 ings of the thermometer and barometer made by the 

 tide observers and from which the above results have 

 been deduced. 



