Two turntables are arranged in a concentric array with a plurality of reaction tubes arranged on each respective turntable, in which one turntable is rotated while, on the other hand, the other turntable is stopped. It is possible to measure the intensity of a light beam passed through the reaction liquid...http://www.google.fr/patents/US4908186?utm_source=gb-gplus-shareBrevet US4908186 - Automated chemical analyzer
