http://www.archive.org/details/correctionofecho00watsilli
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UIUC's Foellinger Auditorium, designed in the Beaux Arts classical style by C. H. Blackall, a University alum, has seen the likes of John Phillip Sousa, Jane Addams, Eleanor Roosevelt, and Spike Lee grace its stage. But 100 years ago, the "limited appropriations for the building made it impossible to embellish the surface of the walls and ceiling, and therefore, they were left practically plain, which increased their power to reflect sound and create echoes." As described in Bulletin No. 87 of the UIUC Engineering Experiment Station, 3,315 square feet of Akustikos Felt mounted on wooden ribs built out from the walls finally managed to correct the problem. The Engineering Experiment Station was established in 1905 by an act of the University's Board of Trustees to "carry on investigations along various lines of engineering, and to make studies of problems of importance to professional engineers." Digitization of all of the Engineering Experiment Station Bulletins was recently completed and the bulletins will be available soon through Illinois Harvest.
