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)
es, every object will appear inits due proportions, and the appearance will be as though the observerhad been transported to the immediate vicinity of the objects themselves. The distance between the large mirrors should not exceed the breadthof an ordinary window, unless the instrument is to be… … This figure represents the exterior appearance of the instrument.The pictures are inserted at the opening seen on the right; the lid atthe top admits and regulates the light on the pictures. The picturesare seen through the tubes. ^97. Figure 29.—The principles of the stereoscope.— This instrument…
Physics · Astronomy
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