RIDDELL, ROBERT. Mechanics' Geometry . . . Illustrated by Accurate Explanatory Card-Board Models and Diagrams. 2 lithographed plates; 52 lithographed diagrams, including 4 in the form of loose folding stiff card geometric models. 4to, original cloth, spine ends rubbed, blistering on front cover and stains on rear; occasional foxing generally not affecting lithographed matter, lower inner corner of page 41 discolored by laid-in slip of paper. first edition. Philadelphia: Claxton, Remsen & Haffelfinger, 1874