Artifact Details Title Proportional compass Catalog Number B225.82 Type Physical object Description Proportional compass with steel major and minor points (at either end). The body of the instrument is silver and the points are black. This sample has scales of lines, circles, planes, and solids. Dimensions are of closed instrument. Date undated Dimensions overall: 3/4 in x 6 1/2 in x 1/2 in Category Pre-computer/other Collection Title Gwen Bell artifact and book collection Series Title Pre-computing artifacts Credit Courtesy Gwen and Gordon Bell Lot Number B225.82