A system of natural philosophy, designed for the use of schools and academies (1845)
Moffat, J[ohn] M. [from old catalog] · Philadelphia, E. C. Biddle · leaf 419
he lamp is a plano-convex lens, which receives on its plane surface the reflected lightof the lamp, and concentrates it on the object, which is mag- How may the images be made permanent ? What purpose is effected by the lid and its sectoral side-pieces repre-sented in the figure ? What are the… … nified by another lens fittedto the extremity of a tubeprojecting from the lantern.The objects are painted onthin plates of glass, whichmay be passed through anarrow opening in the tubebetween the two lenses.This tube must be doubleone end moving within theother, so that the tube car-rying the…
Physics
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