Elliptical Arch Scribbing Tool and Method

An elliptical arch scribbing system, comprising:

• a first flatstock arm comprising a lengthwise slide for a first vertex pivot and comprising a first end;
• a second flatstock arm comprising an angle indicia proximal a first end and comprising a lengthwise slide for a second vertex pivot;
• an axis configured to interlock the two flatstock arms proximal respective first ends in a fixed angular relation based on the angle indicia;
• and
• an elliptical arch template blank comprising a first and a second vertex pivots and a co-vertex pivot fixed on the elliptical arch template blank.

A method for scribbing an elliptical arch, the method comprising:

• fixing an axis between a first flatstock arm comprising a lengthwise slide for a first vertex pivot and comprising a first end and a second flatstock arm comprising an angle indicia proximal a first end and comprising a lengthwise slide for a second vertex pivot, the axis configured to interlock the two flatstock arms proximal respective first ends in a fixed angular relation based on the angle indicia;
• scribbing a first half of an elliptical arch on an elliptical template blank via a scribbing point proximal the axis by sliding the first flatstock arm along the lengthwise slide on the first vertex pivot and sliding the second flatstock arm along the lengthwise slide on a co-vertex pivot;
• and
• scribbing a second half of the elliptical arch on the elliptical template blank via the scribbing point proximal the axis by sliding the first flatstock arm along the lengthwise slide on the co-vertex pivot and sliding the second flatstock arm along the lengthwise slide on the second vertex pivot.