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The experimental observation of critical phenomena in liquid-vapour, binary liquid, magnetic and other systems is discussed. A wide variety of techniques is considered. Each method is treated in detail, and its advantages and inherent problems discussed. Recent precise work is stressed. The results are presented in a normalized graphical form and integrated with data obtained from older techniques whose reliability is assessed in the light of present knowledge. An introduction to the main physical ideas is provided.
Peter Heller (Sat,) studied this question.