Letters on natural magic, addressed to Sir Walter Scott, bart (1834)
Brewster, David, 1781-1868. n 84239125 · London : J. Murray · leaf 107
MIRRORS OF VARIABLE CURVATURE. 95 it the figure required. The projected image of this figure at A' B' C D' may then be accurately copied. The effect of a cylindrical mirror is shown in Fig. 12, which is copied from an old one which we have seen in use F,g. 12. … The method above described is equally applica- ble to concave cylindrical mirrors, and to those of a conical form, and it may also be applied to mir- rors of variable curvature, which produce different kinds of distortions from different parts of their surfaces. By employing a mirror whose surface…
Scientific recreations
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