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    The second side of the poster has been cropped into three parts for ease of reading. These particular instruments were manufactured by the E. Vernon Hill Company based in Chicago.

    Psychrometers, also known as…

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    High-performance liquid chromatography analyzes the components of a sample by pumping a solution through a column containing an adsorbent material, which separates and interacts distinctly with the components. The flow…

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    High performance liquid chromatography analyzes the components of a sample by pumping a solution through a column containing an adsorbent material, which separates and interacts distinctly with the components. The flow…

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    Advertisement about using various models of Beckman pH meters for monitoring water quality in industrial settings.

    Arnold Beckman invented his first pH meter in 1934 at the request of a chemist from the California…