Artist's depiction of an 8-cylinder engine for a 1925 Rickenbacker car. Label on back: "Eight-cylinder motor, right hand side. Note symmetry of parts and general [?]ness of design. Alloy steel motor support is shown at front. Newly designed water pump, extremely efficient, is clearly shown. Note accessibility and protection of distributor head and spark plug wires. Oil gauge is shown at center of block. Note the connection between the motor and transmission is of greatest extent possible and, therefore, maximum rigidity." Handwritten on back: "Rickenbacker, 1925."
