. Automotive industries . there is a space, in which the source of light may be placed,such that, when the light source is wholly in the space, allof the light falling on the reflector will be reflected eitherhorizontally or in a downward direction. The surface of the reflector is generated by revolving,about its horizontal axis, a parabolic arc whose parameie*. Photograph of surface Illuminated by bearCrockett reflector. Crockett head lamp reflector. gradually increases as the arc is revolved through 180deg. from its upper vertical to its lower vertical to the drawings, the
. Automotive industries . there is a space, in which the source of light may be placed,such that, when the light source is wholly in the space, allof the light falling on the reflector will be reflected eitherhorizontally or in a downward direction. The surface of the reflector is generated by revolving,about its horizontal axis, a parabolic arc whose parameie*. Photograph of surface Illuminated by bearCrockett reflector. Crockett head lamp reflector. gradually increases as the arc is revolved through 180deg. from its upper vertical to its lower vertical to the drawings, the plane GH, through the axisA and on one side thereof, will cut the reflector in a para-bolic arc B; and any other plane GN through the axis Aand on one side thereof, will cut the reflector in a parabolicarc having a parameter greater than that of the arc cut bythe plane GH; and the parameter of the section will in-crease as the cutting plane passes from the position GHto the position GK, where the parameter of such an axialsection will have its greatest value, the corresponding sec-tion of the surface being the parabolic arc C. Thus thesections of the surface, made by planes through axis A,are parabolic arcs, all having the common axis A and thecommon vertex V, the focus of each arc being situated onthe axis A between F, which is the focus of the parabol
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectaeronautics, bookyear
