Science and art drawing : complete geometrical course ; consisting of plane and solid geometry, orthographic and isometric projection, projection of shadow's the principles of map projection, graphic arithmetic and graphic statics (1895)
Spanton, J. Humphrey (John Humphrey) · London : Macmillan · leaf 269
Fig. 55. Cut out the sector of a circle (Fig. 55) of any radius, and then fold it along any two radii00 and OA till the free edges OBand OB coincide. This model isrepresented in Fig. 56. The three sides of the sphericaltriangle are represented by theletters a, h, and c, and the anglesformed by the… … Fig. 56. B SPHERICAL TRIANGLES 249 The plane of the great circle which forms the equator hasan imaginary line passing through its centre at right angles toit, and terminated at the jpolcs on the surface of the sphere;this line is called the ^olar axis. Every great circle has an axis. In Fig. 57 the…
Geometrical drawing
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