A movable target, inscribed "Count the dots", above two rows of dots. The target slides along a square rod engraved on top with a scale and on the side "concave" and "convex". The turned knob on the sliding target also serves as a clamp to lock the target in position. Nickel plated brass, with blackened brass lens holder. 12 1/2" long.
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© 2006, American Artifacts, Taneytown, Maryland.