Description

Superb & Hard-to-Find Topp’s Patent Framing Tool / Square – Nov. 1, 1892

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Offered here is a rare and highly collectible example of the Topp’s Patent Framing Tool, patented November 1, 1892 by Thomas R. Cook and manufactured by G.A. Topp & Co. of Indianapolis, Indiana. This ingenious layout tool combines the functions of a try square and bevel, designed specifically for framing and roofing applications.

The tool features a swinging secondary blade that allows for precise rafter layout, with one blade marked with roof pitch tables and rafter length calculations—an early and elegant solution for complex framing geometry. The stock is typically made of cherry, and survi