Reprinted from the January 2017 Issue of Written By: Gary Schmid, Jason Schmid, Daniel H. Herring of Industrial Heating Magazine and Mike Grande of Wisconsin Oven Prior to World War II, Cincinnati, Ohio-based Derrick Company was a local brick-maker that used large kilns in the manufacture of bricks from clay mined from the hillsides of Cincinnati and northern Kentucky. During World War II, there was a need to heat treat large tank parts for use in the North African theater, which prompted Harry Derrick Sr. to devise a way to use his brick-making kilns as heat-treating ovens. The results were