Daniel Schwenter

[1] His works include Delicia Physico-Mathematicae (Nuremberg, 1636) and Geometriae practicae novae et auctae tractatus I-IV (published posthumously in 1641).

As a linguist, Schwenter was familiar with Greek, Hebrew, Arabic, Syriac, and Aramaic.

This is a universal joint that allows a microscope, mounted on the ball, to be swiveled into any position.

[2] One part served as a reservoir for ink and included the writing point.

Squeezing the pen forced ink to flow through a small hole in one of the first part's quill fragments and from there to the writing point.

A portrait of Daniel Schwenter from Geometriae practicae novae et auctae tractatus
A diagram showing the various angles of cut of a cone required to produce a parabola , hyperbola , and ellipse . From Schwenter's Geometriae practicae novae et auctae tractatus .
Deliciae physico-mathematicae , 1636