File:Optic Projection fig 48A.jpg

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Description caption: "Fig. 48 A. Wall Receptacles with Separable Cap. Wall receptacle with the connecting prongs polarized so that the cap can be put in only one way, thus avoiding change of polarity with direct current."
Date
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Optic Projection: Principles, Installation and Use of the Magic Lantern, Projection Microscope, Reflecting Lantern, Moving Picture Machine, by Simon Henry Gage and Henry Phelps Gage, Ph.D. Ithaca, New York, Comstock Publishing Company. 1914. page 86.

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current06:41, 9 February 2008Thumbnail for version as of 06:41, 9 February 2008751 × 1,249 (131 KB)DavepapeBot (talk | contribs)==Summary== {{Information |Description=caption: "Fig. 48 A. Wall Receptacles with Separable Cap. Wall receptacle with the connecting prongs polarized so that the cap can be put in only one way, thus avoiding change of polarity with direct current." |Sou

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