The Geographer's Protractor Designed by Prof. F. Debenham. Ivorine, ... On the upper side there are some useful features in the scales for the direct plotting of map projections, ...

This side of the protractor is marked: WIDDIFIELD & CO 148 WASHINGTON ST BOSTON. The back of the protractor bears scales dividing the inch into 60, 50, 45, 40, 35, and 30 parts; and a plotting scale ...

This two-sided six-inch boxwood rule has a scale of chords and architect's scales dividing the inch into 45, 40, 35, 30, 25, and 20 parts on one side. The other side has an inch scale divided to 1/10" ...