DICTIONARY OF AVIATION 67
��control kan'trool n.
1. a device for controlling, managing, or governing an airship or flyer in any respect.
front control, a control located in the front or fore part of an aircraft; a bexdike front contjollmgsdevice or for- ward elevator, as at the end of the front outrigger of a bi- plane.
lateral control, a control for regulating lateral or side effects, as air^currents ; a control for securing sidewise or transverse equilibrium or balance; a side control.
2. the act or power of direction or guidance, as of an air- ship ; regulation, as of equilibrium : as, a system of three* rudder control.
compound control, control or regulation which is made up ef, or invelvs, several elements or processes; a system of aeroplane control in which, by two^directional movement of a single lever or wheel, the aviator operates two regulating? devices such as a vertical and a horizontal rudder.
threezrudder control, control of an aeroplane flying*ma- chine by means of three rudders.
3. a locality, as a town, which is used as a regulating* center or point of reference or basis of operations, as along the route of an aeroplane^race.
control-frame k9n'troo},fseem . a frame, such as a bedy* cradle or shoulder^yoke, by which the control of an air* craft is effected; a frame by means of which the move- ments of the operator's body are utilized in controlling or balancing a flying^machine.
control-lever kan'tjpo^hi-vaz n. a handover for operating a front or other control, as in a biplane.
controlling-lever kan'troo-hrj^ii-vaz: n. a lever used in controlling or regulating an airship; one of the levers in an aeroplane by the manipulation of which the operator works the controls.
controlling-means ksn'troo-hr^miinz n. a means or me- dium by which the control of an airship is maintaind; a control^arrangement.
control-wire k9n'troo,waiz n. a wire by means of which a control is operated : as, a *control*wire shield.
convection k9n'vek$an n. the action of conveying or carry- ing; specifically, the transportation of energy, as heat, by molar motion of bodies pervaded therewith, as in the ascen- sion of heated air or water.
compound atmospheric convection, the total transfer of heat from one part of the atmosfere to another by currents or by condensation of water vapor into cloud-