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Great collectible item - see photos for overall condition.
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Show vorticella colony on weed and T/S of orange peel.
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This brass gauge is in generally very good condition although untested.
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This formula applies: h = (H) dP/(P + dP). P is the absolute stereo parallax. One places the parallax bar on the photo plane so that a fixed mark over one photo coincides with a movable mark (fused visibly in the stereo view) by turning a screw drive that translates that mark into coincidence.
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This is Part 8. Contents: Planet Earth, Earth's Moon, 11-Tooth Gear, Vertical Support Arm. This does not affect your statutory rights.
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