COMPOUND BAR-LIMB MICROSCOPE WITH A 'CAPTAIN PERRY' ARM
MAKER:SWIFT
MODEL: 'PRESENTATION MICROSCOPE'
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c.1877
SIGNED: 'JAMES SWIFT, 43 UNIVERSITY ST, LONDON W.C. PATENT'


The darkwell holder accepts any of the three different diameter darkwells. These darkwells have unusually long stems. The darkwells are used with a Lieberkuhn reflector. Light reflected by the mirror up through the darkwell holder is re-directed back downward into the darkwell.