Experimental science. Elementary, practical and experimental physics (1890)
Hopkins, George M. (George Milton), 1842-1902 · New York, Munn & co. · leaf 289
- adhering lint anddust. The paper tubes are made dead black inside andoutside. The front of the stage is provided with a pair of thinbrass springs, which serve to clamp the object slide with alight pressure to the stage. In the back of the stage, belowthe central aperture, is formed a groove for… … ^^\^^ Triangle and Paper Tube. Full Size. black glass polarizing plate. The groove supports the blackglass at an angle of 54 35 with the plane of the stage, or atan angle of 35 25 with the holes in the stage and handpiece. The polarizing plate may consist of a plate ofpolished black glass, but it…
Physics · Lantern projection · Electric apparatus and appliances
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