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Plumb Line and Board, 1939. Creator: Walter PraefkePlumb Line and Board, 1939
Telescope from Selenographia, 1647 (1956). Selenographia is a work by the German/Polish astronomer Johannes Hevelius (1611-1687)
Using a quadrant with a plumb bob to calculate the height of a tower by triangulation, 1551. From Rudimenta Mathematica by Sebastian Munster. (Basel, 1551)
Johannes Hevelius, German astronomer, 1647. Known now by the latinized form of his name - Jan Hewel or Hewelcke - Hevelius (1611-1687)