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Show 187 [ 243 ] REMARKS: 'rhe elevations which have been given iu the course of the preceding report, are found ed upon the annexed barometrical observations, and it is scarcely necessary to say are offered onlv as the be~t indications we have. rrhe barometers were compared with tho~?e of Dr. G. Engelman, of St. Louis, Missouri, whose observali on~ are given for a corre~ponding period. The following is tiJC re~mlt of forty comparative observations of three barometers in ·tituted by him from lVIay 22d, to May 29th, 1842, at St. Louis. Runge of buromelers during that period 0''.400, temperatllle 60° to 75°. Barometer E, as observed for and noted in the journal of the academy : = Fremont's Troughton (T.)- 0".136 =Fremont's Carey (C. ) - 0" .178. Range in the differences: 1\Jean E = Fremont's Troughton (T.)- 0".136 = Fremont's Carey (C.)- 0".178. Mininum = " " -0" .116 = " ~' 0". 16i . . Maximum = " " -0".150 = " ': 0".190. Range _ " " 0" .034 = " " 0" .023. In the annexed observations, the barometers, 'rroughton and Carey, are desio-nated respeclively by the letters T. and C. In calculation the observa- 1 ion~ at the upper slations were referred to the single corresponding observation for the relative period of time at the lower station. It wonld perhaps have been better to refer to the mean of the observations for the month at the lower station. In calculation, the tables used were those of Bessel and ~f Oltmanns, as given in Humboldt. |
