Spiral Screwdrivers of Decatur, Illinois
Excerpted from The Chronicle Vol. 49, no. 1, March 1996 By Clifford D. Fales The availability of better wood screws and the rise of the factory system in the last quarter of the nineteenth century saw a proliferation of patents for more efficient tools for driving screws. Isaac Allard’s spiral screwdriver patent of 1868 began …