Airships past and present, together with chapters on the use of balloons in connection with meteorology, photography and the carrier pigeon . rd. A non-return valve prevents the air from escaping,and the capacity of the air-bag is about 5,300 cubic feet, when it is completely air is slightlycompressed by theaction of the gustsof wind, and thispressure extends tothe hydrogen andreacts upon theenvelope. This isresisted by an in-ternal pressure equalto that on the out-side, and also by thestatic pressure actingon the top of theballoon, which, ac-cording to Parsevalsreckonings, amountst
Airships past and present, together with chapters on the use of balloons in connection with meteorology, photography and the carrier pigeon . rd. A non-return valve prevents the air from escaping,and the capacity of the air-bag is about 5,300 cubic feet, when it is completely air is slightlycompressed by theaction of the gustsof wind, and thispressure extends tothe hydrogen andreacts upon theenvelope. This isresisted by an in-ternal pressure equalto that on the out-side, and also by thestatic pressure actingon the top of theballoon, which, ac-cording to Parsevalsreckonings, amountsto the pressure of acolumn of water, 0*3or 04 in. high. Ifthere is a sufficiencyof gas the envelopemust always retainits shape. As soonas the pressure increases owing to the rising of the balloon, theair is pressed out of the air-bag into a steering-bag through aconnecting valve. The wind therefore automatically fills upany deficiency which may arise. The balloon assumes an inclined position at an angle of about30Q or 40° to the horizontal; this is effected through the methodby which the ropes are attached. It is held captive by a rope. Fig. 11G.—Drawing showing the design of thekite-balloon. Ventil = valve. Kette = belt. Entleerungsloch = hole foremptying the balloon of its contents. Ventilleine = valve-line. Buchse = stuffing box. Fiillansatz = inflating des Ballonets = seam of the air-bag. Ballonetmaul =opening into the air-bag. Maul des Steuersacks = openinginto the steering-bag. Ballonet Ventil = valve of = steering-bag. ? Ansatz des Steuersacks = neckof steering-bag. 190 AIKSHIPS PAST AND PRESENT. which is not attached to the basket, but to the front and backof the balloon. These ropes are so arranged as to prevent thelong body of the envelope from being bent, and it is very impor-tant that the longer axis of the balloon should be kept pointingin the direction of the wind. This is effected by means of asteering-bag, which is connected to the
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