Carpenter, William Benjamin, 1813-1885 · London : John Churchill · leaf 150
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. … Powell and Lealands Achromatic Condenser. centres of these are covered by stops of different sizes, sup-plied by the second or stop.-plate; by which very ingeniousarran2:ement, a great variety of combinations may be obtained,aU of them indicated by the numberm^ on the two milled-heads.57.…
Microscopy
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