Vintage 1940's Practical Design for Arc Welding, 2 Volumes, by Hobart

2 volume set of Practical Design for Arc Welding published by Hobart and written by Robert E. Kinkead. Copyright 1943, 1944.  Rather than the typical how-to books, these are intended as workbooks where a student could sketch ideas for construction of various industrial tools and more.  Vintage estate sale find, please review photos. There are some stains/discoloration to the covers. They have been gently cleaned with a damp cloth but we're in a dirty garage for likely decades. Otherwise, these are like new. They were never drawn in, pages are in great shape and the binding are tight. A neat find for welders and engineers.