Wood, J. G. (John George), 1827-1889, West, Tuffen, Knapp, Arthur M., former owner · London ; New York : Routledge, Warne, and Routledge · leaf 37
intensity. 26 DIAPHRAGM. To the under surface of the stage is generally affixeda circular plate of metal, pierced with holes of variousdiameters, and called a diaphragm. It is a usefulinstrument, and is employed for modifying the amountof light which is thrown by the mirror through thehole in the… … THE DIAPHRAGM. seen on the left hand of the engraving, and which fitsslightly into a notch. As a general rule, the smallerholes should be used with the higher powers, as the pencil of light ought to be rather smaller than thediameter of the object-glass. Should the observerwish to shut off all the…
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