[Clarke, William], 1800-1838 · Boston, Munroe and Francis · leaf 113
arge box.The lens being turned towardthe prospect, would form a pic-ture of it, nearly at its focus;but the rays, being interceptedby the mirror, will form the picture as far before the surface as the focus isbehind it, that is, at the bottom of the larger box; a communication beingmade between the… … OPTICAL AMUSEMENTS. Ill D C, and drawing a curtain round to prevent the admission of the lightswhich would disturb the operation, can trace a distinct outline of the picturethat appears at the bottom of the box. There is another kind of camera obscura, for the purposes of drawing,constructed thus :…
Sports · Amusements
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