The Ge-Organon or World Delineated; a Substitute for the Terrestrial Globe. Part. 1st Invented by B. Donne

• Main Author: Donn, Bemjamin
• Format: Map
• Language: unknown
• Published: Benjamin Donn 1788
• Subjects: Arctic; Gunter
• Online Access: https://www.davidrumsey.com/luna/servlet/detail/RUMSEY~8~1~348418~90116101; https://media.davidrumsey.com/MediaManager/srvr?mediafile=/Size4/RUMSEY~8~1/205/15401001.jpg

Bristol, published by the author as the act directs, March 25th 1788. "A New Earth Instrument -- The Ge-Organon -- By The Prolific Mathematician, Mapmaker and Inventor of Navigational Objects Benjamin Donn Fascinating "new instrument invented by [Donn] for the study of geography," one of a number of map and navigation objects created by Donn during his career in Bristol in the second half of the 18th Century. Benjamin Donn was both a prolific writer, mathematical instructor and seemingly an inventor of new devices for navigation and the use of maps, globes and similar instruments. He taught courses to mariners and published several works on mathematical instruction. As noted by van Poelje: A number of articles from his hand have appeared, in the “Gentleman’s Magazine” and the “Mathematical Repository”, during the second half of the 18th century on subjects like a Davis’ Quadrant, an Orrery, lunar and tidal instruments and an “Analemma”, “Panorganon” or “Georganon” for solving “Problems of the Globe”. In his 1796 book “An Essay in Mechanical Geometry”, he informs the reader that " .from 1766 to the present time I have invented mechanical aids to the most important propositions in Geometry, 50 schemes and models in card-paper, wood and metal." Donn was active in designing, and also in selling his instruments at his Academy: the production of his designs he had delegated to instrument makers and engravers. While best known for his award winning 1765 County Map of Devon, Donn produced a number of other maps while in Bristol. Among his more fascinating undertakings, Donn proposed improvements on the Analemma, a variation on what is known as the Standard Gunter Rule for recurring navigational calculations, and a Panorganon and Ge-Organon, intended to be reliable means of calculating geographical distances and times without the use of a globe. His Ge-Organon would seem to be a continuation of his prior work on a Panorganon ("for Solving the Common Problems of the Terrestrial Globe) . The Panoragon (a type of horary ...