Review of reviews and world's work . the hull, at the bow and stern. Pumpinga greater amount of air into the front bal-loonet inclines the bow; then the craft isdriven down against the buoyancy of thegas. But it must move in spirals to descend,because the car is hung far below the other words, its center of gravity isvery low. This car weighs 5 tons and carries a massof machinery, which includes two motors,each of no horse-power, and having sixcylinders; there is also a centrifugal pumpfor supplying air to the ventilator that servesthe balloonets. The definite purpose of the modern dir
Review of reviews and world's work . the hull, at the bow and stern. Pumpinga greater amount of air into the front bal-loonet inclines the bow; then the craft isdriven down against the buoyancy of thegas. But it must move in spirals to descend,because the car is hung far below the other words, its center of gravity isvery low. This car weighs 5 tons and carries a massof machinery, which includes two motors,each of no horse-power, and having sixcylinders; there is also a centrifugal pumpfor supplying air to the ventilator that servesthe balloonets. The definite purpose of the modern dirig-ible is to carry useful loads over great dis-tances, but this cannot be done unless the sup-ply of gas is kept at its normal buoyancy,exactly as the ocean liners is fixed, that itmay not only float but make voyages onnearly a time schedule. Navigators of air-ships have no idea of becoming idea is a craft that will behave like aship on the water. The Zeppelins are agreat advance in that direction ; their designer. THE BRIDGE OF THE ZEPPEUN switchboard for directing operations is seen threw overboard all flabby built a solid ship filled with gas cham-bers. Packed away in its hold as storage,they are protected by the air-space betweenthem and the outer hull from the force ofair-currents and from changes in the sunsjadiation, which exhausts the gas. It has re-sulted in a near approximate to a fixed sup-ply, sufficient lifting force having been re-tained in the chambers for more than threeweeks. This fact explains Count Zeppelinslong voyages. Inclosing these gas bags with-in the hull eliminated the rocking of the gas,which makes the progress of the airship souncertain; consequently it is not necessary tostrain the gas bags by blowing them up withair-bladders. The entire absence of this in-ternal pressure, which diminishes the liftingforce and subjects the envelope to tension,has kept the gas bags so tight that they holdtheir supply to a h
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