A London encyclopaedia, or universal dictionary of science, art, literature and practical mechanics : comprising a popular view of the present state of knowledge : illustrated by numerous engravings, a general atlas, and appropriate diagrams (1829)
Curtis, Thomas, fl. 1820 · London : Thomas Tegg · leaf 185
projection. Prop. IV. Theor. IV. A less circle notparallel to the plane of projection is projectedinto a conic section, whose transverse axis is inthe line of measures; and the distance of itsnearest vertex from the centre of the plane ofprojection is equal to the tangent of its nearestdistance… … duced, its intersection with the plane of projec-tion will be a conic section. Thus the coneD A F, having the circle D F for its base, beingproduced, will be cut by the plane of projectionin an ellipse whose transverse diameter is df;and C J is the tangent of the angle CAD, andC /■ the tangent of C…
Encyclopedias and dictionaries · Aeronautics
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