Airships past and present, together with chapters on the use of balloons in connection with meteorology, photography and the carrier pigeon . scoverer of hydrogen, suggested he should take small bottlesfilled with water, in which he should collect samples of the atmo-sphere at different heights. His results may be tabulated asfollows:— Time. TemperatureFahrenheit. Barometerin inches. Hydro-meter. Altitude infeet abovesea level. Rate of ascent in feet per second. Rate of change of temperature per 100 feet. Remarks. ( 5140 35 30-027-0250 03 262 2, 1-64 1-83 -0-42-0-254 cloudyc
Airships past and present, together with chapters on the use of balloons in connection with meteorology, photography and the carrier pigeon . scoverer of hydrogen, suggested he should take small bottlesfilled with water, in which he should collect samples of the atmo-sphere at different heights. His results may be tabulated asfollows:— Time. TemperatureFahrenheit. Barometerin inches. Hydro-meter. Altitude infeet abovesea level. Rate of ascent in feet per second. Rate of change of temperature per 100 feet. Remarks. ( 5140 35 30-027-0250 03 262 2, 1-64 1-83 -0-42-0-254 cloudycloudy The direction of motion above the clouds was determined bythrowing out a number of cards. The description of the prepara-tions that were- made for the journey shows that it was done on 240 AIRSHIPS PAST AND PEE SENT. strictly scientific lines with the greatest care, and the results areinteresting, though no account was taken of the direct effect ofradiation from the sun, and consequently the temperature valuesare only correct so long as the sky was covered with made a second expedition on January 7th, 1785, which. Fig. 14G.— Dr. Jeffries with the barometer used on his ascents. has already been described in some detail. It maybe noted thaton this occasion the first trigonometrical observations of theheight of a balloon were made from the French coast, and thealtitude was found to be 4,800 ft. No barometric readings appearto have been taken on the ground level, so that it is not possibleto deduce much from his readings. Hellman, the meteorologist of Berlin, has clearly shown that SCIENTIFIC BALLOONING. 241 Jeffries was the first to attempt meteorological observations froma balloon, though for many years it was supposed that a mannamed Eobertson was the first scientific balloonist. He madean ascent on July 18th, 1803, in the old French military balloon Intrepide, which had already done duty at the battle ofFleurus. The start was made at Hamburg with anothe
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