Brewster, David, Sir, 1781-1868, Bache, A. D. (Alexander Dallas), 1806-1867 · Philadelphia : Lea and Blanchard · leaf 271
slate in three seconds, and thin tile in fourseconds. Cylindrical Mirrors (183.) All objects seen by reflexion in a cylindrical mirrorare necessarily distorted. If an observer looks into such amirror with its axis standing vertically, he will see the imageof his head of the same length as the… … CHAP. XXXVIII. ON SPECTACLES. 267 direction, and in intermediate directions the head will haveintermediate breadths. If the axis of the mirror is held hori-zontally, the face will be as broad as life, and exceedinglyshort. If a picture or portrait M N is laid clown horizontallybefore the mirror A…
Optics
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