Photograph taken for a newspaper owned by the Oklahoma Publishing Company. Caption: "Chicago's latest skyscraper, the Tribune Tower, was formally opened to the public, today July 6th. This wonderful building, which is the last word in Gothic architecture, has been under construction for over two years, and crowns a competition in which architects in twenty two countries engaged, the leading participants receiving prizes aggregating $100,000. Tribune Tower and site cost eight and one half million dollars and the building proper rises to a height of 473 feet. The flag was ceremoniously raised at sunrise to the top of the staff, which is 600 feet above ground."

From Introduction: "The data in this bulletin were obtained during an investigation of screening practice by the University of Illinois engineering experiment station and the United States Bureau of Mines under a cooperative agreement between them and the State of Illinois Geographical Survey Division. The present investigation was limited to a study of screening as applied in preparing mineral products with the expectation of obtaining more comprehensive information on screening machinery."