Antique Cabinet Card Photograph. Identified on reverse side as Elmer Willmarth. Photo by Shervee Studio, Worcester, Massachusetts. Measures approximately 4.25 x 6.5 including mount. Condition: This is an original photograph, not a copy or reproduction. It is in very good condition. Comments: Elmer H. Dana Willmarth co-authored with Forest C. Willmarth a book published in 1937 titled "Engineering Problems Manual." He was a 1897 graduate of Worcester Polytechnic Institute and associated with the Willmarth Tool Works of Cleveland, Ohio. He had a relative, most likely his son, named George Willmarth.