The art of projecting. A manual of experimentation in physics, chemistry, and natural history with the porte lumiere and magic lantern. (1892)
Dolbear, A. E. · Lee and Shepard · leaf 93
;* THE ART OF PROJECTING. wooden pulley s, about an inch in diameter, is made to turn upon an axis that is made fast in the post ft, and with such adjustment that the pulley rests upon the … Pig. 59. 0V plate a and turns by friction on that plate. It is best to have a thin india rubber ring upoiH^tfe friction pulley to insure it from slipping. AbpmiQe pulley the mirror m is so mounted as to swing^i Wzimuth, and is made to do by a wire fastened to it at i^Jnnge, and bent into a loop l…
Light · Magic Lantern
Internet Archive · Public domain (published before 1931). Free to use for anything.
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