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 DICTIONARY OF AVIATION 119

gyrator 'dsai^etazr, /Isai'zee-taz w. he who or that which

gyrates or whirls. gyratory 'dsai-za^ozi adj. moving in a gyre, circle, spiral,

or helix; revolving; whirling. gyre dsaiz n.

1. a turning round, revolution, whirl; a circular or spiral turn.

2. a ring, circle, spiral, or helix; also, a vertex. gyroplane 'dsai-^pteen n. a flying^machine in whose de- sign the principle of sustention by means of gyrating or rotating aerofoils is given prominence ; a flyer of the heli- copter type.

gyropter /isai'zeptez n. a gyrating or rotating wing or aerocurv; also, a flying^machine of the helicopter type in- vented or advocated by Davidson.

gyroscope 'dsai-z^skop n. a device consisting essentially of a rotating wheel mounted in a ring and having its axis free to turn in any direction, exhibiting in its action the opposition which the axial momentum of a rotating body makes to any change in the plane of its rotation.

gyroscopic ,dj ai-za'skopik adj. pertaining to or of the na- ture of a gyroscope; rotatory.

gyroscopic effect, the balancing^effect of gyroscopic action; the stedying^effect characteristic of the gyroscope.

gyroscopic motor, a motor or gasoline engin in which, by rotation of cylinders, etc., a certain gyroscopic effect is ob- taind.

gyroscopic stability, stability or stediness of an airship due to gyroscopic action of revolving aerofoils or other ro- tary mechanism.

gyrostat 'dsai-^stset n. a device consisting ordinarily of a rapidly rotating fly-wheel pivoted as finely as possible within a rigid case, having a convex curvilinear polygonal border, in the plane perpendicular to the axis thru the center of gravity of the whole.

gyrostatic /Isai-za'staetik adj. pertaining to the gyrostat or gyrostatics ; connected with the principle that a rotating body tends to maintain its plane of rotation.

gyrostatically /Isai-za'staetikg-h adv. in a gyrostatic man- ner.

gyrostatics ,d3ai-z9'staetiks n. the science of gyrating or rotating bodies.

��hail heel n. ice or frozen vapor falling in pellets or masses in a shower from the atmosfere.

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