This letter to an unidentified person at Beckman Instruments, Inc. describes an omission in the Model G pH meter documentation, which does not include replacing the batteries as a possible fix for a specific problem.
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Arnold Beckman invented his first pH meter in 1934 at the request of a chemist from the California citrus industry, who needed an accurate way to measure the acidity of his product. The resulting instrument kicked off…

Beckman Instruments entered the gas chromatograph business in 1956 with the acquisition of the successful Watts Manufacturing Company. Later that year, Beckman Instruments produced its first gas chromatograph, the GC-1,…

Arnold Beckman invented his first pH meter in 1934 at the request of a chemist from the California citrus industry, who needed an accurate way to measure the acidity of his product. The resulting instrument kicked off…

This particular model of centrifuge was air-driven.

Beckman Instruments began producing centrifuges after their January 1, 1955 acquisition of industry leader, Specialized Instruments Corporation, or Spinco. With…

The TJ-6 centrifuge was introduced in 1976.

Beckman Instruments began producing centrifuges after their January 1, 1955 acquisition of industry leader, Specialized Instruments Corporation, or Spinco. With Spinco came…

Arnold Beckman invented his first pH meter in 1934 at the request of a chemist from the California citrus industry, who needed an accurate way to measure the acidity of his product. The resulting instrument kicked off…

The Model R Industrial pH Meter was first produced in 1942, although this photograph was likely taken much later.

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

This instrument detects pollutants in the exhaust from vehicles with combustion engines.

Beckman Instruments, Inc. became interested in measuring, controlling, and fighting air pollution in the late 1940s and early…

Beckman Instruments began producing centrifuges after their January 1, 1955 acquisition of industry leader, Specialized Instruments Corporation, or Spinco. With Spinco came the famous Model E Ultracentrifuge, which was…

Developed from a Linus Pauling design during WWII, the technology behind Beckman Instruments’ oxygen analyzers ended up doing such diverse jobs as monitoring astronauts’ respiration, maintaining packaged food safety,…

This instrument measures the nitrogen oxides (NOx) produced during the combustion of gasoline. Once in the atmosphere, they can contribute to the formation of smog and air pollution.

Beckman Instruments, Inc. became…

The system this unidentified woman is using includes a Model 152 Mircrofuge.

Table of spectrophotometer and pH readings of various substances, including strychnine, caffeine, amphetamine, benadryl, and ascorbic acid. As this document is undated and vaguely titled, it is unclear which instrument…

Arnold Beckman invented his first pH meter in 1934 at the request of a chemist from the California citrus industry, who needed an accurate way to measure the acidity of his product. The resulting instrument kicked off…

Arnold Beckman invented his first pH meter in 1934 at the request of a chemist from the California citrus industry, who needed an accurate way to measure the acidity of his product. The resulting instrument kicked off…

In this memo, Jan Haagen-Smit includes a labeled photograph of the testing set-up for the Beckman oxygen electrode, which includes Beckman Oxygen Analyzers. The memo (but not the photograph) in this digitized image is a…

This advertisement for the Model G pH meter highlights the different electrodes that could be used with it. The Model G was Beckman Instruments's first commercial pH meter.

Arnold Beckman invented his first pH meter in…

This instrument detects pollutants in the exhaust from vehicles with combustion engines.

Beckman Instruments, Inc. became interested in measuring, controlling, and fighting air pollution in the late 1940s and early…

The first Beckman Instruments DU Spectrophotometer was developed in 1940, when the company was still called National Technical Laboratories. Spurred by employee Howard Cary (who had previously been involved in pH meter…

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…

Owners of the Model G would have found these instructions tucked inside the lid of the wooden case surrounding the instrument.

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

Instructions and a visual diagram for hooking up 3 #5540 batteries to power a Beckman Model G pH Meter. These three smaller batteries could replace a single, large 22.5 volt battery. This diagram was written on Bob…

This artwork depicts the "Age of Instrumentation" as the culmination of centuries of scientific progress through five stages: Discovery, Curiosity, Analysis, Technology, and Automation. This painting was featured in the…

Advertisement for multi-turn potentiometers made by the Helipot Division of Beckman Instruments.

Potentiometers regulate the flow of electricity, like the volume dial on a radio. In 1940, Arnold O. Beckman was…