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A London encyclopaedia, or universal dictionary of science, art, literature and practical mechanics : comprising a popular view of the present state of knowledge : illustrated by numerous engravings, a general atlas, and appropriate diagrams (1829)

Curtis, Thomas, fl. 1820 · London : Thomas Tegg · leaf 287

An illustration from A London encyclopaedia, or universal dictionary of science, art, literature and practical mechanics : comprising a popular view of the present state of knowledge : illustrated by numerous engravings, a general atlas, and appropriate diagrams, 1829, leaf 287
one or twoof them will suffice to show how many more maybe made. 489. If we wish to make a catoptric cistulato represent several diflerent scenes of objects,when viewed at different iioles, it is only necessaryto provide a ])olygonous box, of the figure of themultilateral prism, ABCDE, in the… … with plane mirrors :in the lateral planesmake round holes,through which theeye may be direct-ed within the cellsof the box. Theholes are to be co-vered with plainglasses, groundwithin, but notpolished, to preventthe object, in thecells, from appear-ing too distinctly.In each cell are to be placed…

Encyclopedias and dictionaries · Aeronautics

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