Model #69 Center Square
Chappell Center Squares are the first Center Squares to combine a center rule with a square and are great for detail layout when working from center lines. Both body and tongue front and back have conventional inch ruling on the edges and a center rule scale along the center of each leg. All scales in the decimal inch, with minor divisions at the 1/4" and further into 20ths.
Body 1-1/2" x 8", Tongue 1" x 6"