Experimental science. Elementary, practical and experimental physics (1890)
Hopkins, George M. (George Milton), 1842-1902 · New York, Munn & co. · leaf 290
lens of suitable focus may be pressedinto the service. The face of the stage and other parts ofthe instrument visible through the analyzer are blackened.The object to be viewed is placed on the stage andfocused, when the instrument is held so that the black glasspolarizing plate reflects the light… … Holder for Glass. object, or between the stage and black glass plate. Micaplates of suitable thickness are selected by trial in the instru-ment, and preserved for future use. It is sometimes desirable to rotate the polarizer. Whenthe black glass plate is used, this is impracticable, but onremoving…
Physics · Lantern projection · Electric apparatus and appliances
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