Airships past and present, together with chapters on the use of balloons in connection with meteorology, photography and the carrier pigeon . ugh the importance of theirwork, in some cases at any rate, was undoubted. A member ofParliament named Powell made an ascent for meteorologicalpurposes, with Captain Templer and Captain Gardner; but hewas unfortunately drowned through falling into the sea, while theofficers barely escaped with their Glaisher made twenty-eight ascents for scientific purposes, andwas the first to adopt really accurate methods. His plans werecarried out with the gre
Airships past and present, together with chapters on the use of balloons in connection with meteorology, photography and the carrier pigeon . ugh the importance of theirwork, in some cases at any rate, was undoubted. A member ofParliament named Powell made an ascent for meteorologicalpurposes, with Captain Templer and Captain Gardner; but hewas unfortunately drowned through falling into the sea, while theofficers barely escaped with their Glaisher made twenty-eight ascents for scientific purposes, andwas the first to adopt really accurate methods. His plans werecarried out with the greatest care, and included a wide range of 1 See Wilfrid de Fonvielle, Les Grandes Ascensions Maritimes. Ghio. 1882. B 2 244 AIESHIPS PAST AND PEE SENT. observations, which were made at short intervals throughout thejourney. His results are embodied in the reports of the BritishAssociation, and included observations from the following points:—(1) Determination of the temperature of the atmosphere, andof the amount of moisture contained in it at different heights,particularly at the higher levels. Determination of the dew-. FiG-. 148.—Glaisher and Coxwell in the basket. point by means of Daniells wet bulb thermometer, Eegnaultscondensation hygrometer, and of the psychrometer both in itsordinary form and with the addition of an aspirator. In thecase of the latter, large quantities of air were to be passedthrough the vessels containing the thermometers at differentlevels, more especially the higher levels ; special attention tobe directed to the highest levels which are suitable for humanhabitation, with special reference to the mountains and plateaux SCIENTIFIC BALLOONING. 245 of India. At these heights the readings of the psychrometer tobe carefully compared with those of Daniells and Eegnaultshygrometers. (2) Comparison of the readings of an aneroid with a mercurybarometer up to heights of 5 miles. (3) Determination of the electrical properties of theatmosphere.
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