Contributions in geographical exploration . herefore the studyof the temperatures of the vents in the Valley. In this project, as well as in the chemical study of thevolcanic gases, the expeditions were aided by the GeophysicalLaboratory of the Carnegie Institution, which undertook tosupply the necessary equipment. But on account of the warconsiderable difficulty was experienced in securing the requisiteinstruments. Potentiometers of the Leeds and Xorlhrop typewere not to be had. It was indeed by the narrowest margin thatany pyrometers were obtained at all. L]) to within twenty-fourhours of th
Contributions in geographical exploration . herefore the studyof the temperatures of the vents in the Valley. In this project, as well as in the chemical study of thevolcanic gases, the expeditions were aided by the GeophysicalLaboratory of the Carnegie Institution, which undertook tosupply the necessary equipment. But on account of the warconsiderable difficulty was experienced in securing the requisiteinstruments. Potentiometers of the Leeds and Xorlhrop typewere not to be had. It was indeed by the narrowest margin thatany pyrometers were obtained at all. L]) to within twenty-fourhours of the departure of the expedition we had not succeededin obtaining any instruments whatever. But on the last day apyrovolter from the Pyrolectric Instrument Company, ofTrenton, New Jersey, and a pyrometer from the HoskinsManufacturing Company, of Detroit, arrived. Although such hasty tests as could be made amid the hurryof the last preparations for departure indicated that liothinstruments were in working order, it was not possible to gain 249. March, 1911)] Temperatures of Ten Thousand Smokes 25*1 that acquaintance with their behavior nor to test the accuracyof their readings, which everyone will recognize as highlydesirable preliminaries to the use of any instruments. But notwithstanding these handicaps, the instruments didgood service in the field, giving identical and aj^parentlytrustworthy readings at all times. At the beginning of thework their readings were compared in the vapor of FumaroleNo. 1, which was convenient to our camp; and again at theclose of the season, when checked at the same vent, they gavethe same readings as at the beginning, thus allowing us torepose confidence in their readings throughout. Two months later, when they were unjjacked after beingreturned to Columbus, it was observed that, while the Hoskinsinstrument was apparently still in good order, the battery(dry cell) of the pyrovolter had completely gone bad. Theywere then repacked and shipped to the G
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