Carpenter, William Benjamin, 1813-1885 · London : John Churchill · leaf 149
as large as that of the lens, having its central part more orless completely occupied by a solid disk, which may so nearlyfin the circle, as to leave but a mere ring through which thelight may pass. Such apertures are shown in the diaphragm-plates in Pigs. 35 and 36.—The Condenser thus completed… … Eosss Achromatic Condenser. carried Mr. Gilletts plans into operation, the diaphragm-plate has the shape of a short frnstrnm of a cone (Fig. 35), soattached to the condenser, that the portion of the plate whichpasses through it shall cut ittransversely; each aperture isindicated by a number on…
Microscopy
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