The tube assembly is cradled in a holder that has a side-to-side drive mechanism which effectively focuses the microscope (motion is imparted parallel to the objective axis). Opposite the control knob for the focus drive is a plate that carries a second very large clamp screw and washer. This was either used to mount the entire assembly on a fixture to the subject could be examined, or was used to mount the actual sample. I suspect the former since the working distance of the objective appears to be about 35mm - well beyond the plane of the focusing plate.
This is a very nicely machined instrument and seems to be in close to new condition. The optics are perfect
Photo set 1420.
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