Murdock references receipt of correspondence and a blood sample from Noyes, expresses pleasure at Millikan's interest in his work, and discusses real estate matters, including the erection of apartment buildings.

Beckman discusses cancer treatment options for his friend and colleague, Dr. Amos A. Noyes, and offers to provide Glover with a pH meter.

The letter regards Arthur Noyes's test results and serum supplied for his treatment.

The receipt lists materials the De Forest Television Corporation received from Arnold O. Beckman. The memorandum concerns work Beckman performed for the American Television Corporation, the De Forest Television…

In this letter, Beckman confirms that Duschak can indeed use one of the new "acidimeters" and return it to National Technical Laboratories afterwards. This letter also reveals that during the initial production of the…

Lee de Forest discusses testing Beckman's film-coating process with antimony. A sample of antimony paper is included.

This report outlines the colorimetric and electrical ways to determine the pH of a solution and the various kinds of electrodes that can be used with electrical instruments. Beckman concludes that a method using glass…

Lee de Forest states that he has "temporarily become disassociated from the activities of De Forest Television Corporation" and advises Beckman to retain any equipment currently in his possession.

Lee de Forest…

Lee de Forest states that he returned from a trip to Chicago to find his company in financial disarray. He regrets that Beckman's contracted work was continued, despite an inability to pay for it, and assures him that…

The letter discusses Beckman's scheduled meetings, marketing strategies for the pH meter, and interest in postal meters.

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

Evans writes to Beckman while he is on a trip to New York City about advertising and production of the new pH meter, especially the Model M.

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

The letter was written during a multi-city trip, most likely in Pittsburgh or New York. Beckman discusses the cases of the instruments, and his desire to replace metal cases with wood; pricing of the instruments; and…

This letter, written while Arnold Beckman was on a multi-city trip promoting his pH meter, concerns strategies for marketing the instruments and concern about the friction between a salesman and distributor.

Arnold…

In this letter, Evans discusses a new electrode design for use in Beckman pH meters.

Arnold Beckman invented his first pH meter in 1934 at the request of a chemist from the California citrus industry, who needed an…

Lyons thinks the new system of distribution for the Beckman pH meter will be an important change for the "industrial field." The National Postal Meter Company on the letterhead was one of Arnold Beckman's first…

This page of instructions would have been located inside the lid of the pH meter, so that users would be able to read the instructions upon opening its case.

Arnold Beckman invented his first pH meter in 1934 at the…

Arnold Beckman offers a scathing critique of Herring's performance as a salesman of pH meters.

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

This page of instructions would have been located inside the lid of the pH meter, so that users would be able to read the instructions upon opening its case.

Arnold Beckman invented his first pH meter in 1934 at the…

The series of photographs depicts employees of National Technical Laboratories.

The brochure details the components and specifications of the Model R pH meter, manufactured by National Technical Laboratories and branded as a "Beckman pH Meter."

Arnold Beckman invented his first pH meter in 1934 at…

Written by NTL (the precursor to Beckman Instruments, Inc.), this document outlines new standards for buffer solutions used in pH meters.

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

The Beckman Instruments IR spectrophotometers began as a request from the Office of Rubber Reserve to Arnold O. Beckman in 1942, asking for an infrared spectrophotometer that they could use to create rubber. Under this…

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…

The brochure touts the benefits of a device which automatically dispenses a pH-controlled chlorine germicide rinse. Soda fountains, bars, and lunch counters are the target market.

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,…