Carburetion System Automotive Repair Poster c.1930 Henley Mechanical DiagramLocation of Carburetion System Troubles Made Easy. (Old Posters, Automotive, Carburetors, Mechanical Diagrams, Advertising, Americana). Issued c. 1930, New York by the Norman W. Henley Publishing Co. Early 20th century mechanical advertising diagram of this automotive system. Based on the byline at the bottom, appears to have been available for commercial sale. Nice looking, clean, well preserved example, any age flaws easy to overlook or forgive.