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Practical plane and solid geometry for advanced students, including graphic statics, adapted to the requirements of the South Kensington syllabus (1899)

Harrison, Joseph, Baxandall, George Albert · London Macmillan · leaf 112

An illustration from Practical plane and solid geometry for advanced students, including graphic statics, adapted to the requirements of the South Kensington syllabus, 1899, leaf 112
blem.—To describe an ellipse having given itscentre C and three points P, Q, R on the curve. Join CQ and. PR intersecting in H. With centre Cradius CQ, describe a circle, and through Zf draw the chordpr of this circle, such that/ZT: Hr = PH\ HR ; and drawthe radius Cs perpendicular to CQ. Join sr… … SyS. required ellipse. The principal axes can be determinedby Prob. 87. This construction is based on some theorems of projection. Therequired ellipse is supposed to be projected into a circle. A figuresimilar to the projection is drawn of such a size and so placed that CQcoincides with its own…

Geometry, Descriptive -- Problems, exercises, etc · Geometry, Plane -- Problems, exercises, etc · Graphic methods

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