Airships past and present, together with chapters on the use of balloons in connection with meteorology, photography and the carrier pigeon . of the en-closed air reacts on the rubbermembrane, which will besucked inwards during a de-scent, and blown outwards ifthe balloon is rising. Themovements of the membraneare communicated by verydelicate wheelwork to a pointeron the face of the case, whichtherefore shows at a glance whether a rising or falling movementis in progress. It is not always necessary to throw out ballast in the caseof a momentary descent. The movements of overhead breezesdo not
Airships past and present, together with chapters on the use of balloons in connection with meteorology, photography and the carrier pigeon . of the en-closed air reacts on the rubbermembrane, which will besucked inwards during a de-scent, and blown outwards ifthe balloon is rising. Themovements of the membraneare communicated by verydelicate wheelwork to a pointeron the face of the case, whichtherefore shows at a glance whether a rising or falling movementis in progress. It is not always necessary to throw out ballast in the caseof a momentary descent. The movements of overhead breezesdo not usually take place in straight lines, but rather partakeof the nature of wave motion. A balloon which is in a stateof equilibrium usually follows a path of this sort. Under suchcircumstances one would merely be wasting ballast if it werethrown overboard to counteract a fall; with a little patience, itwould soon be found that the balloon rises again of its ownaccord. It is therefore rather a matter of determining therelative motion between the aeronaut and the surroundingatmosphere, and for this purpose von Sigsfeld has devised the d 2. Fig. 17.—The statoscope, byGradenwitz. 36 A1KSHIPS PAST AND PRESENT.
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Keywords: ., bookcentury1900, bookdecade1900, bookpubl, booksubjectaeronautics
