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Lot 296: A 17TH-CENTURY BRASS GRAPHOMETER SIGNED FRANZISKUS VIEB
October 20, 2016
Padova, ItalyLive Auction
Description: Brass with semi circular crown, engraved with goniometric scale on the outside, from 0 to 180 ° below 10 ° in 10 ° and reading the fourth grade; within a second semicircular scale with the square incision of scale shadows. At the center pivots the bar with the mobile alidade on the stairs above those at whose extremes are the two leaflets dual milestone for aiming. Swivel joint for the inclination of from 0 to 90 ° tool, to have the possibility of measuring both horizontally (distances) and vertically (heights). On the joint engagement to the tripod stud for placement in the country. Dimensions: diameter mm. 260; semi circular crown, mm. 20; mobile alidade mm. 236; central bush, diameter mm. 20.
Condition Report: Compass glass and needle seem to be later, otherwise overall condition good. German brass Graphometer signed "Franciscus Fiebig fec.". An early example of a Holland Circle. Franciscus Fiebig, also Franziskus Viebig, worked in 1633 in Arnstadt and 1647 in Haag; less than one dozen instruments are in museums collections.