DICTIONARY OF AVIATION 151
forced into the bearings; lubrication by eil which is fur- nisht to the bearings under pressure.
gravity lubrication, lubrication by means of eil which is caused to flow into the bearings by the force of gravity.
splash lubrication, lubrication of an engin by means of a splash of eil brought about by enclosing the crank and con- necting-red in a case fild with oil to a certain level such that the crank dips into it and spatters the eil upward over the appropriate surfaces.
��machine ma'Jiin n. a structure or vehicle; an apparatus for applying or converting power; specifically, an air-machine; a flying-machine.
altitude machine, a flying-machine designed for attaining great altitudes; an air-machine adapted to high-flying.
endurance machine, a flying-machine designed for great endurance; an air-machine adapted to making continuous flights of long duration.
passengertcarrying machine, a flying-machine designed for carrying passengers ; an air-machine adapted to transporting other persons besides the aviator himself.
speed machine, a flying-machine designed for attaining great speed; an air-machine adapted to sunft flight.
weight4ifting machine, a flying-machine designed for lift- ing and carrying great weight; an air-machine of great lifting-capacity; a weight-carrier.
mackerel-sky 'maekgza^skai n. a sky dappled with small tuhite fleecy clouds resembling the markings of a mackerel; a mackerel sky; cirro-cumulus; spotted alto-stjatus.
main-line 'meen,lain n. the principal line or stjing of a kite; the main kite-line, compare pennantzline.
main-plane 'meen,pi,een n. one of the main or principal supporting-planes or aerofoils in an aeroplane flying-ma- chine.
m animate -cirrus rr^mee-to'sizas n. a rounded festoon- shaped cloud related to cirrus.
mammato-cumnlus n^mee-to'kgumju-las n. cloud consist- ing of protuberances en the under side of an otherwise flat-bettomd cloud.
man-bearing 'maenjDer-ziij adj. bearing aleft, or carrying, a man ; man-lifting : as, a *man-beanng kite.
man-bird 'm3en,bB:zd n. [also spelt manbird]
1. [ploral manfbirds'] an artificial bird or flyer operated
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