In this optical instrument with a cone-shaped body, mounted on top of a central pillar with tripod legs that could be folded. The mirrors are so arranged that the angle between them can be varied at pleasure, vintage line drawing or engraving illustr Poster #395685522
In this optical instrument with a cone-shaped body, mounted on top of a central pillar with tripod legs that could be folded. The mirrors are so arranged that the angle between them can be varied at pleasure, vintage line drawing or engraving illustr Poster #395685522
