Airships past and present, together with chapters on the use of balloons in connection with meteorology, photography and the carrier pigeon . g, and is perhaps difficult for an out-sider to understand the many-sidedactivity of the balloonist in thisfield of research, and to form anidea of the problems that are await-ing solution. It may thereforebe as well to quote a portion of the speech made by when he opened the conference at Berlin in hiscapacity of president. Our first task consists not in carry-ing out the largest possible number of simultaneous ascents,either with
Airships past and present, together with chapters on the use of balloons in connection with meteorology, photography and the carrier pigeon . g, and is perhaps difficult for an out-sider to understand the many-sidedactivity of the balloonist in thisfield of research, and to form anidea of the problems that are await-ing solution. It may thereforebe as well to quote a portion of the speech made by when he opened the conference at Berlin in hiscapacity of president. Our first task consists not in carry-ing out the largest possible number of simultaneous ascents,either with or without observers in the car, but in organisingthe basis of co-operation by the employment of accurate instru-ments, which are constructed on similar principles. The out-lines of such arrangements as are possible to secure the use ofsimilar instruments were discussed at our first conference atStrassburg. Since that time, such balloons as carry observershave been fitted with the aspirator-psychrometer devised byAssmann and Sigsfeld; and balloons without observers havecarried the recording instruments due to the indefatigable industry. Fig. 156.—Captain Gross. 254 AIRSHIPS PAST AND PRESENT. of Teisserenc de Bort. The recording balloon has become amost useful auxiliary, and has brought us most surprising-results out of the icy regions at a height of twelve miles aboveour heads. Berson and Siiring rose to heights of six miles, andin so far as their records go they confirm the results obtained. Since the monthof November, 1900,simultaneous as-cents are made onthe first Thursdayin the month atParis, Strassburg,Munich, Berlin,Vienna, St. Peters-burg, and Moscow;and on May 5th,1902, the 213threcording balloonwas sent up. The seed thussown has bornegood fruit. It hadgenerally been be-lieved that Glai-shers results werecorrect, and thatat fairly low levelsthe temperature Fig. 157.—A recording balloon with instruments. remained Constant throughout the year. But this has been shown
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