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aerodynamic AEROSTATICS aileron AIR CORPS air-speed AIRCRAFT INSTRUMENTS airfoil airplane airship altimeter altitude amount angle of attack arming wire atmospheric attached axis ballonet balloon battery beam blade bomb hoist brake cable carrying hooks cell cent center of pressure compass compressor connected construction cubic feet cylinder density determined diameter electrolyte engine envelope equipment external bomb rack fabric ferrosilicon flight force fuselage fuzes gauge gear handle hangar helium horsepower hydrogen inches increase indicator inflation inspection installation latch lift liquid load loop magnetic manometer maximum mechanism metal nonrigid nose observation balloon operation oxygen Paragraph pilot pipe pitch plate pointer position pounds pressure propeller release resistance revolutions per minute rope rudder Section shaft shown in Figure side sodium hydroxide specific gravity speed stability standard static steel superheat surface tachometer tail tank temperature tube type A-3 valve velocity vertical volume weight wing