Chemical analyzing apparatus

A chemical analyzer comprising

• means including a turntable for defining a circular reaction line and transporting a plurality of reaction vessels along said circular reaction line;
• means for rotating said turntable in a backward direction by n pitches and in a forward direction by n+1 pitches repeatedly to advance said reaction vessels in the forward direction step by step;
• means for delivering a sample and at least one reagent into successive reaction vessels to form in each reaction vessel a test liquid which is a mixture of said sample and said at least one reagent;
• means including a plurality of measuring units arranged along said circular reaction line, each of said measuring units measuring each test liquid twice to produce two measured values when a reaction vessel containing a relevant test liquid is stopped at a relevant measuring unit between successive backward and forward movements and between successive forward and backward movements of said reaction vessels along said circular reaction line;
• and
• means for receiving two measured values for a test liquid supplied from each of said measuring units to derive a difference between said two measured values supplied from each of said measuring units to derive analytic results for each test liquid.