a guitar for obtaining, and moving to a photo, the things and outlines of things, to be able to represent all of them within their correct geometrical relations as viewed from one point.
a guitar for obtaining, and moving to an image, the things and outlines of things, so as to portray all of them in their proper geometrical relations as seen from some one point.
An instrument of varied kinds for getting or moving to a surface the points and outlines of things.
a guitar for drawing the perspective of an object from the orthogonal projections, that's, its plan and elevations. Some types of the instrument may able, by reversal, of representing the orthogonal forecasts of an object from the perspectives or photographs. The latter forms are employed in photographic surveying (which see, under surveying).