This is the first working prototype of many, a protractor adapter for your standard 18 cork backed ruler. It adds a pivot point along its…

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Breman Precision Metal Ruler 18 Inch - Stainless Steel Cork Back Metal Ruler - Premium Steel Straight Edge 18 inch Metal Ruler - Flexible Stainless

Breman Precision Metal Ruler 18 Inch - Stainless Steel Cork Back Metal Ruler - Premium Steel Straight Edge 18 inch Metal Ruler - Flexible Stainless Steel Ruler - Imperial and Metric Ruler

Hampshire teacher re-invents the protractor - Product Idea Design and Invention Development, Prototypes, 3D CAD, Patents

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