Carpenter, William Benjamin, 1813-1885 · London : John Churchill · leaf 149
aphragm-plate is madeso small that it can bereceived into the interiorof the stage (Fig. 37),but is rotated by amilled-head beneath; andthe edge of this is markedby numbers, each signify-ing a particular aperture,and thus marking by itsposition toliich apertureis in use. As, however, the smallness… … Smith and Becks Achiomatic Condenser. ACHEOilATIC COXDEXSER.—EEFLECTIX& PKISIMS. 127 hoiir and minute-hands of a Tvatch), by means of a secondmilled-head, numbered at its edge like the first; and theapertures in the diaphi-agm-plate being simple circles, the Fig. 37.
Microscopy
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