A MANNHEIM AND MULTIPLEX SLIDE RULES INSTRUCTION BOOK by the Eugene Dietzgen Company, Chicago, Illinois. This 1908 publication of 60 pages measures 7 inches in height by 4 inches in width. Written by L.W. Rosenthal, this book includes detailed instructions for the use of the Mannheim and Multiplex slide rules. There are two two fold-out three-section illustrations of the scales on each type of slide rule. Length = 7.00 Inches (Ref. Id No.: 123336) [Free Shipping]