pressure-plate

‘pseSez,pucet nu. a plate used in as cert a i nang the pre ure of the wind. pre ure-reaction ‘psefoz-ziekjon m. the reaction of a moving aeroplane to the pre ure of the atmosfere acting against it. pre ure-region ’pse§az,z1i-dgon. a region of airzpre ure, as against the under or the upper surface of a moving aero for i. pre ure-value ‘psefaz,votiv n. the value or numerscal amount of the pre ure of a fluid, as air upon an aeroferl. primaried ’psai-mo-zzd adj. furnisht with primaries or primary fethers: as, nine-*primaried. primary ‘psai-ma-zi m. one of the wingzfethers seated upon the manus or hand of a bird. prob pseb n. old prob, the chief of the wether-bureau; the wether: prefet. projector pso’dsektez n. an apparatus for projecting or throwing a beam of light, eften consisting e entially of a parabolic mirror. pronation pso’nee-Son 7. the act or result of pronating; the prone position of the forearm 1n which the bones of che forearm are more or le crest and the palm of the hand turnd downward: the oppos it of supination. propellant pso’pelont m. an agent or force that propels; a propelling-agent. propeller pso’pelaz n. any device for propelling, driving forward, or rmpartrng translatory motion; a contrivance such as an oar, a paddl-wheel, or especially a screw, actuated by a motor and used for the propulsion of an airship; a screw propeller. collapsible propeller, a propeller so made as to be capable of being collapst or folded up. curved propeller, a propeller the cre -section of whose blades, rn a plane pa ing thru the shaft, is curvd; a propeller the surface of the rotation of whose blades is curvd. dihedral propeller, a propeller whose blades form a dihedral angle with each other. fan propeller, same meaning as fanzpropeller. flexible propeller, a propeller whzrch rs made of flexible material mounted on a frame; a nenzrigzd propeller; a collapsible propeller. multibladed propeller, a propeller having several or many blades. nonrigid propeller, an aerial propeller which is not rigid; a flexible propeller. plural propellers, propellers which are placed sever at upon one gtven flying-machine; propellers two or more of which are placed upon a single machine; multiple propellers. rear propeller, a propeller which is placed rn the rear or hind part of an air-raft. compare tractor propeller. screw propeller, a propeller in the form of a screw or system of blades arranged spirally around a centgal hub attacht to a rotatrng shaft and made to rotate by power. single propeller, a propeller which is single or the only one upon a given flying-emachine. compare plural propellers. straight propeller, a propeller the cra -section of whose blades, in a plane pa ing thru the shaft, is straight; a propeller the surface of the tigon of whose blades ts a plane normal to the shaft. tractor propeller, a propeller wahicet ts placed in the front or fore part of an aircraft, thus acting as a tractor drawing the machine forward; a tractor screw; a: front propeller.