Physical characteristics of this quadrant: Material: Yellow Brass; Length of Limb: 6-3/8" (163 mm.); Radius of Graduated Arc:5-1/8" (131 mm.); Thickness of Plates (Tot.): 7/64" (2.5 mm.); Chord Length of Limb: 9-1/16" (230 mm.); Sight Radius:2-3/8" (60 mm.); Gerry Young -- a student seeking Truth. 01:00, 22 July 2009 (UTC) Photograph of instrument from my personal collection taken by me on 29 April 2003. The cord and plummet are modern restorations to illustrate the use of the quadrant.