Patent ID: 8458916

Claim:
A tool for forming portions of a circle, comprising in combination: an elongate rigid mass of material extending from a first end to a second end opposite said first end; a pivot hole adjacent said first end adapted to receive a pivot element therethrough; a plurality of marking holes spaced from said pivot hole at varying distances from said pivot hole; said marking holes sized to receive a marking tool passing therethrough; indicia adjacent said marking holes corresponding to measurement of a distance of said marking holes from said pivot hole; wherein side edges extend substantially from said first end to said second end, said side edges being straight; wherein a plurality of graduations are located adjacent at least one of said side edges and extending perpendicularly from said straight side edge adjacent thereto, said graduations located similar distances from each other such that measurement along said side edge is facilitated by said graduations; wherein each said marking hole has a graduation adjacent thereto, a position of said graduation indicative of a distance from said pivot hole to said marking hole adjacent thereto; and wherein said elongate rigid mass of material includes a contoured top surface including an elongate central groove extending between said first end and said second end, said tool including a shuttle slidably located within said groove, and adapted to slide between said first end and said second end, said shuttle including a marker support thereon.