. American engineer and railroad journal . when the axis of propulsioniloes not through the center of inertia. If the system is perfectly rigid, this lowering or elevationis not produced, and there will be a most decided us suppose that the prow , the l)otlom of the balloonolTers to the current more surface at the froht end and less althe back ; on the other hand, the gas is preci|iitated towardthe front. For these two reasons the deformation of the sys-tem due to llie variation of the speed tends to accentuateitself ; but when the connection is rigid and llic perman
. American engineer and railroad journal . when the axis of propulsioniloes not through the center of inertia. If the system is perfectly rigid, this lowering or elevationis not produced, and there will be a most decided us suppose that the prow , the l)otlom of the balloonolTers to the current more surface at the froht end and less althe back ; on the other hand, the gas is preci|iitated towardthe front. For these two reasons the deformation of the sys-tem due to llie variation of the speed tends to accentuateitself ; but when the connection is rigid and llic permanenceof the shape assured, the system constitutes a kind of block :and as the center of gravity is .always below Ihe point of ajipli-cation of the ascensional force, it is sullicient for some oscilla-tions to simply stop the screw. The up and down motion canalso be produced by a cause which has not as yet receivedsuflicient attention. I wish to speak of the vertical rupture of ((piilibrium occurs, which gives an speed V ^fig. :!), for instance, this speed is composed of thevelocity V, and the resistance to exercised alongthe line A, which augments the resistanc(- very much, anilmay bring about .serious complications with a long the inevitable escape of gas, the continual (lianges inthe condition of the atmosphere, the variations of Ihe solarra<liation. etc , modify Ihe vertical equilibrium at every in-stant. Instead of the usual rudimentary means, which consistof opening the valve and throwing out ballast, which onlycorrect the displacement that has been jiroduced. it is nccessaiythat lliere should be some arrangement which isstill It) be discovered. Kurlhermore. it is iir<)])er lo remarkthat bv increasing the speed pro|)er we will increase the in-stability in a horizontal plane, .so that the automatic arianie-ment desired is really very useful only at lower velocities,which will mark, for a number of years
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
