Airships past and present, together with chapters on the use of balloons in connection with meteorology, photography and the carrier pigeon . of a mans ear was SCIENTIFIC BALLOONING. 279 cracked at a height of 10,000 ft., though he had previously madeover 100 ascents, and had often reached heights of 23,000 ft. Inany case it is to he hoped that there will he no further attemptsto break the record in this department. On meteorological expeditions observations on atmosphericelectricity ought not to be neglected. There is much to be donein this field ; as a matter of fact, we know even nowadays l
Airships past and present, together with chapters on the use of balloons in connection with meteorology, photography and the carrier pigeon . of a mans ear was SCIENTIFIC BALLOONING. 279 cracked at a height of 10,000 ft., though he had previously madeover 100 ascents, and had often reached heights of 23,000 ft. Inany case it is to he hoped that there will he no further attemptsto break the record in this department. On meteorological expeditions observations on atmosphericelectricity ought not to be neglected. There is much to be donein this field ; as a matter of fact, we know even nowadays littlemore than was known in the days of Franklin and his immediatesuccessors. The potentialgradients ought to be in-vestigated, as also the con-ductivity of the term potential isused to denote the differencein physical state of twobodies carrying electricalcharges. A body at highpotential can only dischargeby being placed in electricalcontact with a body at lowerpotential, and potentialgradients are measured bythe fall over a given principal workers in thisdepartment are the French-man Le Cadet, togetherwith. Fig. 178.—Viktor Silberer, president ofthe Aero Club, of Vienna. Professor Bornstein,Dr. Linke, Dr. Ebert, Dr. Gerdien, Professor Boltzmann, , Dr. Tunia, Dr. Schlein, etc. Lately meteorological observations have been made in Viennaat the instigation of Viktor Silberer. He has fitted out severalsuch expeditions at his own cost, some of which have beencarried out by members of the Aero Club, such as Dr. Schleinand Dr. Valentin. Viktor Silberer has frequently had to apply tothe Austrian parliament for funds and has not always met with avery ready response. Still it must be admitted that under ratherdisadvantageous conditions the Austrians have done good work. 280 AIRSHIPS PAST AND PRESENT. Meteorology has derived considerable benefit from balloonascents and the astronomers have also done the same. Theballoon is specially useful when it is
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