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)
iree images will beseen, as represented by thediagram. Let L be the ob-ject, and the heavy lines thetwo mirrors. Place the di-viders at N, and draw thedotted circle, and an imageof the object will be seen bythe eye at each of the points,1, 2, and 3. The plain arrow-lines represent the incident and… … Kaleidoscope.—This toy depends upon the multiplicationof images by inclined mirrors, as just explained; the mirrors beingplaced at angles varying from 30° to 60°, and inclosed within a suit-able case or tube. In the end of the tube, behind ground glass, is anarrow cell, containing several small…
Physics · Astronomy
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