pitch

pit§ 2. 4. an act of plunging hod foremost. 2. the height to which a bird of prey soars before swoopang down upon its victim: as, to fly a *pitch. 3. the constant distance between fixt points or lines, as between ariy two succe iv convolutions or threds of a screw propeller, or between any two succe iv turns of a screw propeller considerd as moving in a solid nut, mes- “sured in a direction parallel to the axis. straight pitch, the pitch of an aerial propeller the angle of whose blad-surface remains constant, so that the drfferent portions of the blade tend to advance thru the air at different velocities: dirstrnguisht from uniform -pitch. uniform pitch, the pitch of an aerial propeller the angle of whose blad-surface varies from hub to tip in such a manner that all portions of the blade tend to advance thru the air with uniform vele city: distinguisht from straight pitch.