Johnson's natural philosophy and key to philosophical charts : illustrated with 500 cuts; being reduced photographic copies of all the diagrams contained in the author's philosophical series of indestructible school charts ; for the use of schools and families (1878)
n images of naturalobjects, highly magnified. OPTICS. 269 It is mounted in a dark room, before an opening in a shutter. Aplane mirror, M, being arranged outside the shutter in such a positionas to receive tlie direct rays of the sun, and reflect them through thecondensing lens H, which highly… … The magnifying lens may be a small globule of glass, or a compoundachromatic object-glass of short focus. The power of the instrumentdepends upon this lens. Instead of illuminating the object with light of the sun, electriclight, or the oxyhydrogen light may be, and often is, employed, andwith…
Physics · Astronomy
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