Journal - Franklin Institute of the State of Pennsylvania (1826)
Franklin Institute, Philadelphia, Franklin Institute (Philadelphia, Pa.) · [Philadelphia : Franklin Institute] · leaf 26
ravity, neither from within, nor from without th^atmosphere. [to be continued.] Description of an improved form of the Slides for Magic Lanterns. TO THE COMMITTEE ON PUBLICATIONS. Gentlemen,—I send you a description of an improvement in theMagic Lantern, made by me in 1825, an account of which has… … The pulley, a, should be larger than the bottom of the lantern; thearbour around which it works is secured to the base, b; and after pass-ing through the pulley, is received in a socket fastened to the bottomof the lantern; on tliis pulley there is placed a band of glass, c* whichis kept in its…
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