Large accurate metal protractor. This item comprises four pieces: A: Case (velvet lining and padding) B: Main protractor element C: Ruler attachment D: Ruler attachment.. Dimension are of the case.. Patented 11/29/1910
Manufacturer
Dietzen Company
Place Manufactured
U.S.
Identifying Numbers
Model number
Smith's Improved Protractor
Dimensions
1 1/4 x 11 x 7 1/2 in.
Category
Pre-computer/slide rule
Credit
Gift of University of Illinois, Department of Computer Sciences