Carpenter, William Benjamin, 1813-1885, Dallinger, W. H. (William Henry), 1842-1909 · Philadelphia, Blakiston · leaf 289
onally great,it calls here for no special notice. It may be of service to those who are unable or indisposed tospend considerable sums upon condensers to state that an excellent 1 It will be urged that apertures can be exactly reproduced with the iris inphotographic_ lenses ; why cannot they,… … MODE OF USING- THE CONDENSER achromatic condenser can be made by placing a Zeiss aplanatischeLupen on Steinheils formula in the sub-stage.1 These are made intwo different powers, viz. 1 inch and 1^ inch, and we can fullytestify to their being the most useful hand-lenses for ordinary workthat can be…
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