Journal of the Franklin Institute; devoted to science and the mechanic arts (1826)
Franklin Institute (Philadelphia, Pa.) · Oxford, Eng. [etc.] Pergamon Press [etc.] · leaf 289
rument of the magicians ca-binet, and must always perform a principal part in all optical combi-nations. In order to be quite perfect, every concave mirror shouldhave its surface elliptical, so that if any object is placed in one focusof the ellipse, an inverted image of it will be formed in the… … The method of exhibiting the effect of concave mirrors most ad-vantageously is shown in fig. 4, where CD is the partition of a roomhaving in it a square opening EF, the centre of which is about fivefeet above the floor. This opening might be surrounded with a pictureframe, and a painting which…
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