Physical DescriptionAquarium/Tank Microscope. Rolled, cast brass, nickel plating, colorless plate glass. Weighted nickel-plated pillar stand supporting a blackened brass frame holding a 10 x 11 x 1.3 cm glass "aquarium", open at the top. One face of the frame is covered by a large blackened brass plate with nickel-plated fittings. This dovetailed plate slides horizontally, and has a vertical slot with slider carrying a circular aperture (with choice of two diameters). The aperture can thus be positioned over any point in the aquarium, and serves to block stray light. Clamped by thumbscrew to the pillar is the simple microscope, a magnifier on triple-jointed linkage with counterweight and control knobs, thus positionable anywhere in the field. Rack and pinion control allows focusing over a wide range. This linkage is constructed of blackened brass with bright lacquered fittings. (a) Nickel-plated pillar; (b) blackened brass mount for glass tank; (c) blackened brass dovetailed plate; (d) blackened brass slider; (e) removable blackened brass circular aperture; (f) triple-jointed microscope; (g) colorless glass "aquarium". Provenance
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