Brass course plotting instrument
brass; wood; ivory
overall (instrument)l: 4 x 15-1/4 in.; overall (case): 1-3/8 x 16 x 6-1/2 in.
Navigational instrument; Brass course plotting instrument; from the collection of George Elliott (1810-1862); prototype of an instrument meant to be used for plotting courses on charts, as invented and constructed by George Elliott himself; instrument appears to be a combination of something similar to a parallel rule and a protractor, is made of brass (with one piece having an ivory or bone handle), and housed in a wooden box.