Hawkins electrical guide ... : questions, answers & illustrations : a progressive course of study for engineers, electricians, students and those desiring to acquire a working knowledge of electricity and its applications ; a practical treatise (1914)
Hawkins, N. (Nehemiah), 1833-1928 · New York : T. Audel & Co. · leaf 38
Fig 3 797 —Secondary axis. This is any right line passing through the optical center, but not through the centers of curvature. Rays emitted from a point P on the secondary axis PP nearly converge to a center point P on the axis PP, and according as the distance from the ooint P to the lens is… … Fig. 3,789.—Image in convex mirror. Let AB be the object; draw two lines from A, and twofrom B, to the convex side of the mirror. Draw lines from C through these points. Theselines are the normals. Construct the angles of reflection and extend the rays until theymeet. It is found in this case that…
Electrical engineering
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