how if works Continued from page 4 and white photos are. Another machine dries the paper and it is ready to be pasted for making up a page. Headlines and larger type used in advertising are prepared similarly and likewise developed and dried. The paper is easily cut and placed on the page where it is wanted. Photographs, in order to be used in the newspaper, must be copied and enlarged or reduced to fit the proper column width and at the same time are screened with a series of dots of varying density which eventually carry a small portion of ink to the printed page. Pictures and type are then Â· placed onapageanditis sent to the camera room to be photographed once again. The negative from this photographing then is placed beside one of the matching pages in the newspaper and the two negatives are used to expose a thin metal plate which is placed on the press after if has been developed to bring out an image. Another change in the mechanical process is in the printing of the Tribune. Now used is a lithographic offset method using the principle that oil and water do not mix. The engraved plate has small indentations where each letter, period and illustration are placed. These indentations absorb oil-base ink which is kept from the rest of the plate by a thin film of water. The plates are caused to turn on the press and the inked impressions are transferred to a rubber blanket which covers the printing roller. Webs of paper roll off huge rolls and .pass over the rubber blankets which transfer the inked impression to the paper. Color is printed by running the paper web over another printing roller on which the desired color has been imprinted. Three colors -- red, blue and yellow -- in.addition to black may he combined to reproduce a color photograph which 'has all' of the colors. Each color used must be first imprinted on a separate printing roller. After the pages have been printed the webs are gathered on the press and individual papers are cut off and folded, all automatically. An elevator, consisting of a series of clamping devices on an endless chain, takes the finished, newspapers from the press to the mail room which is located on the top floor of the press building at the Tribune. In the mail room the papers have pre-prepared pages inserted, are counted and bundled before being placed in a chute to the dock at ground level for placing in trucks to be delivered to carrier boys or the post office. In all some 175 persons, including carriers, have a hand in preparing, printing and delivering the Tribune each day. CUTTING HEADLINES -- Don (Jack) Roos uses scissors to cut apart lines of headlines. He is working at the developing machine which develops sensitized paper after it comes from the computer. Paper, after it is developed, passes through an electrical dryer. Headlines, as well as other printed matter, are later passed through a machine which places a thin coat of wax on the back. The wax holds paper to make-up page after it is positioned. EASIER TO HANDLE -- Since type is on paper instead of in metal, it is much easier to cut and position on the page. Here Clyde Rhoden makes up a page. Solid page, black portion at top right is for a photograph which will he placed there in the camera room. Advertising is made up and corrected before news is put on the ADJUSTING THE PRESS -- Robert Wendorf of Chicago, a Goss factory installer, left, adjusts ink and water flow on the new press as Bill Clark, press foreman, looks on. Plate, as seen in center of photo, rotates against a rubber-covered cylinder which transfers impression to paper, seen in web, above. Offset process gets its name from the procedure of putting an impression on the rubber blanket before it is transferred to paper.
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