I only want to comment shortly about problems with vibrations. Years ago, I was responsible for a Coulter Elite ESP sorter and had often problems with the sorts. We identified two compressors, standing wall to wall in the next room as the major cause of the problem. Whereas neither compressor alone and its vibration was a problem, both together produced a new vibration at a very low frequency of about 1 to 2 Hz. This low-frequency vibration was indeed our problem. Therefore, one cannot conclude that vibrations cause or don't cause a problem, it depends on the frequency! Hope this helps Andreas PD Dr. Andreas Simm Universitaet Halle Wittenberg Klinik fuer Herz- und Thoraxchirurgie Ernst-Grube Str. 40 D-06120 Halle Tel.: +49 (0) 345 557 2647 FAX: +49 (0) 345 557 2782
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