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.

Daniel Schwenter (Schwender) (1585-1636) was a German Orientalist, mathematician, inventor, poet, and librarian. He was professor of oriental languages and mathematics at the University of Altdorf. His works include Delicia Physic-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. He was also an authority on Euclid. A parabola The parabola (from the Greek: παραβολή) is a conic section generated by the intersection of a a right circular conical surface and a plane parallel to a generating straight line of that surface. ... A graph of a hyperbola, where h = k = 0 and a = b = 2. ... In mathematics, an ellipse (from the Greek for absence) is a plane algebraic curve where the sum of the distances from any point on the curve to two fixed points is constant. ... 1585 was a common year starting on Tuesday of the Gregorian calendar or a common year starting on Friday of the Julian calendar. ... Events February 24 - King Christian of Denmark gives an order that all beggars that are able to work must be sent to Brinholmen Island to build ships or as galley rowers March 26 - Utrecht University founded in The Netherlands. ... Orientalism is the study of Near and Far Eastern societies and cultures, by Westerners. ... The University of Altdorf was a university in Altdorf bei Nürnberg, a small town outside Nuremberg. ... Hl. ... Events February 24 - King Christian of Denmark gives an order that all beggars that are able to work must be sent to Brinholmen Island to build ships or as galley rowers March 26 - Utrecht University founded in The Netherlands. ... Events The Long Parliament passes a series of legislation designed to contain Charles Is absolutist tendencies. ... This article is in need of attention. ... Arabic can mean: From or related to Arabia From or related to the Arabs The Arabic language; see also Arabic grammar The Arabic alphabet, used for expressing the languages of Arabic, Persian, Malay ( Jawi), Kurdish, Panjabi, Pashto, Sindhi and Urdu, among others. ... Syriac is an Eastern Aramaic language that was once spoken across much of the Fertile Crescent. ... Aramaic is a Semitic language with a 3,000-year history. ... Euclid Euclid of Alexandria (Greek: ) (ca. ...

Schwenter and the Scioptric Ball

He is credited with developing the scioptric ball in 1636. This is a universal joint that allows a microscope, mounted on the ball, to be swiveled into any position. Its invention was inspired by Schwenter's studies of the human eye. The scioptric ball provided a firm anchor for a microscope or telescope while allowing the telescope to be swiveled in all directions in order to follow the course of an eclipse or for drawing panoramic views. It was in some ways the first wide-angle lens. Events February 24 - King Christian of Denmark gives an order that all beggars that are able to work must be sent to Brinholmen Island to build ships or as galley rowers March 26 - Utrecht University founded in The Netherlands. ... To meet Wikipedias quality standards, this article or section may require cleanup. ... It has been suggested that microscopy be merged into this article or section. ... 50 cm refracting telescope at Nice Observatory. ... Photo taken during the French 1999 eclipse An eclipse (Greek verb: ecleipo, to cease existing or calypse, to cover ) is an astronomical event that occurs when one celestial object moves into the shadow of another. ... The term panorama originally referred to panoramic painting, but today means any high aspect ratio or wide screen image or film format, especially suitable for landscapes, where a lot of scenery can be taken in at a glance. ... In photography and cinematography, a wide-angle lens is a lens whose focal length is shorter than the focal length of a normal lens. ...

Schwenter and the Fountain Pen

Schwenter did not invent the fountain pen, but in 1636, in his Delicia Physic-Mathematicae, he described a pen made from two quills. One quill served as a reservoir for ink inside the other quill. The ink was sealed inside the quill with cork. Ink was squeezed through a small hole to the writing point. A fountain pen is a writing instrument, more specifically a pen, that contains a reservoir of water-based ink that is fed to a nib through a feed via a combination of gravity and capillary action. ... Events February 24 - King Christian of Denmark gives an order that all beggars that are able to work must be sent to Brinholmen Island to build ships or as galley rowers March 26 - Utrecht University founded in The Netherlands. ... A quill pen is made from a flight feather (preferably a primary) of a large bird, most often a goose. ... An ink is a liquid containing various pigments and/or dyes used for colouring a surface to render an image or text. ... A cork stopper for a wine bottle A Champagne cork Cork material is a subset of generic cork tissue, harvested for commercial use primarily from the Cork Oak tree, Quercus suber, with Portugal producing most cork worldwide. ...

Sources

• Portrait
• Another Portrait
• The Camera Obscura
• Fountain Pen History
• Scioptric Ball
• Picture of an 18th century scioptric ball
• Plates from Geometriae practicae novae et auctae tractatus