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  Teltru psychrometers

  • Undated

  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…

  • Creator Of Work E. Vernon Hill Company
  • Subject Scientific apparatus and instruments, Hygrometry--Measurement, Hygrometers, Hygrometry--Equipment and supplies
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  Wherever there's water, there's pH...

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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…

  • Creator Of Work Beckman Instruments, inc.
  • Subject Hydrogen-ion concentration--Measurement--Instruments, Scientific apparatus and instruments, Beckman Instruments, inc.