Inside Out Library

Elements of plane and solid free-hand geometrical drawing, with lettering; and some elements of geometrical ornamental design, including the principals of harmonic angular ratios, etc. In three parts ... for draughtsmen and artisans; and teachers and students of industrial and mechanical drawing (1878)

Warren, S. Edward (Samuel Edward), 1831-1909 · New York, J. Wiley & sons · leaf 136

An illustration from Elements of plane and solid free-hand geometrical drawing, with lettering; and some elements of geometrical ornamental design, including the principals of harmonic angular ratios, etc. In three parts ... for draughtsmen and artisans; and teachers and students of industrial and mechanical drawing, 1878, leaf 136
1. The circle is a curve, all of whose points are at a uni-form distance, called the radius, from a fixed point within it,called its centre. The ellipse is a curve, such that the sum of the distances ofeach of its points from two fixed points within it is uniform,and equal to the longest line which… … from two foci, F and F, is always the same, and equal to thelongest chord, or transverse axis, AB, of the curve. Manydifferently shaped ellipses, wide or narrow, may thus be formedaccording to the distance apart of F and F, while AB remainsof fixed length. Pins being fixed at F and F, and a firm…

Geometrical drawing · Mechanical drawing

Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.

More pictures from Elements of plane and solid free-hand geometrical drawing, with lettering; and some elements of geometrical ornamental design, including the principals of harmonic angular ratios, etc. In three parts ... for draughtsmen and artisans; and teachers and students of industrial and mechanical drawing

More like this