The science dealing with light, lenses, etc.

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A term pertaining to sound, or the science of sound.


Engineering science pertaining to liquid pressure and flow.


The science that deals with the measurement and description of the physical features of the oceans, seas, lakes, rivers, and their adjoining coastal areas, with particular reference to their use for navigation.


One who studies and practices the science of hydrography


Engineering science pertaining to gaseous pressure and flow.


The science and technology of interacting surfaces in relative motion, including the study of lubrication, friction and wear. Tribological wear is wear that occurs as a result of relative motion at the surface.


1. The science or art of describing elevations of land surfaces with reference to a datum, usually sea level. 2. That part of topography dealing with relief or elevation of terrain.


Part of science which deals with the relationships between heat and mechanical action.


The art and science of conducting a boat safely from one point to another.


An instrument with the optics so arranged that the light rays entering the objective of the lens meet at the crosshairs and appear inverted when viewed through the eyepiece without altering the orientation of the image. See also ERECTING TELE- SCOPE.

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