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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 268

An illustration from 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, leaf 268
angular corners of the tetrahedron), the vertex of which SPHERICAL TRIANGLES 247 must always be the centre of the sphere. The three lines whichform tlie vertex are radii of the sphere, and are called the edgesof the trihedral angle. A similar trihedral angle is always sub-tended on the opposite…

Geometrical drawing

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