The Popular recreator. A key to in-door and out-door amusements .. (1873)
London, New York [etc.] Cassell, Petter & Galpin · leaf 249
or other medium of homo-geneous character, it maintains a perfectly straight course.Unlike Paddys gun, a ray of light will not shoot round acorner. Let us take our lantern, adjust the source of lightat the focal point of the condenser so as to obtain a beam ofparallel rays, remove the power with… … THE MAGIC LANTERN. 237 diameter of a large knitting-needle, pierced in it; on thewooden stage of the gallery we fit to a telescopic stand a If we now remove the two telescopic stands, and view in adark room the ray of light proceeding from the hole in the second metal plate pierced with a similar…
Amusements · Games · Sports
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