Proportional dividers designed to give a scale reduction of either 1/2 or an expansion of 2 times the original scale depending on the need. In: "Geometriae practicae novae et auctae tractatus I[-IV] ..." by Schwenter, Daniel, 1585-1636. Vol. I, page 79. Published posthumously in 1641.

Image ID: libr0075, Treasures of the NOAA Library Collection
Photographer: Archival Photograph by Mr. Sean Linehan, NOS, NGS


Category: Treasure/Geodesy/

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