Brewster, David, Sir, 1781-1868, Bache, A. D. (Alexander Dallas), 1806-1867 · Philadelphia : Lea and Blanchard · leaf 224
end the phenomena are best seen. To the east of the towerthe bulwark is extended in a straight line to the distance of500 feet. It is eight feet high towards the land, with a foot-way about two feet broad, and three feet from the ground.The parapet is three feet wide at top, and is slightly… … tmUm 220 A TREATISE ON OPTICS. PART III. distance will pro an inverted imago of the person under him. If, while standing on the footway another person stands on italso, but at some distance, with his face turned towards thesea, his image will appear opposite to him, giving the appear-ance of two…
Optics
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