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 25
e in the midst of the actors. MOTION PICTURES 2,679 side of the mirror as the luminous point, while the virtual focus is alwayson the other side of the mirror. The distinction between these variousfoci is illustrated in the accompanying cuts. Ques. What is a parabolic mirror? Ans. A concave mirror… … Fig. 3,770.—The parabola. A parabola DAC is a curve such that every point in the curve isequally distant from the directrix KL and the focus F. The focus lies in the axis AB, drawnfrom the vertex or head of the curve A, so as to divide the figure into two equal parts.The vertex A, is equidistant…
Electrical engineering
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