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…

Beckman thanks Evans for his hospitality during a trip to Denver, Colorado to sell the new pH meter and hopes that Evans will become a distributor for the instrument. Beckman's stops in Denver included Coors Porcelain…

Anderson writes from National Technical Labatories to Arnold Beckman, providing him with an update about "acidimeter" production and pre-sales interest while Beckman is away in New York City. He notes that the first…

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

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…

The letter touches on Arthur Noyes's medical condition and discusses problems with an instrument demonstration caused by residue in electrodes. Beckman was a friend and colleague of Dr. Noyes and was seeking medical…

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

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.

Letter regarding a Technical Roundtable hosted by Beckman Instruments to foster dialogue and innovation within the chemical analysis field in California in the 1960s.

Dr. Sternberg does not believe that Perkin-Elmer, Inc. can patent a flame ionization detector, as their instrument would be too similar to the one described in this German patent. The Perkin-Elmer instrument would be in…

This internal Beckman Instruments memo documents some of the difficulties of developing a portable glucose monitor. Items under consideration include a digital read out, whole blood versus dialysis or protein…

This internal Beckman Instruments memo was written just as the first five research prototypes for the new Glucose Analyzer were being sent to external laboratories for evaluation. Dr. Sternberg questions the Beckman…

This job schedule is a snapshot of the work being done by NTL in January, 1934. This work included the important pH meter development for the California Fruit Growers Exchange, of course, but also a project for Lee de…

Glenn Joseph writes to Dr. Beckman about the process of finding the right buffer to use in the new glass electrodes inside the pH meter. The identify of the "Dr. Dupont" referenced in this letter is uncertain.

Arnold…

Description of the Beckman Glucose Analyzer written by Dr. James Sternberg. This draft was sent to another Beckman Instruments' employee for feedback, with the ultimate intention of using it in a magazine article and…

In this letter, Glenn Joseph reports that the vacuum-tube amplifier in the early Beckman pH meter model is (still) not functioning properly. One of the fixes he proposes is replacing the vacuum tubes with a glass…

This letter spells out the instrument maintenance and upgrades that the California Fruit Growers Exchange believe are included with the cost of developing the "glass electrode apparatus" (an early prototype of the…

Invoice from Arnold O. Beckman to W. E. Baier
for developing and calibrating McLeod gauges and glass electrodes -- components involved in the early Beckman pH meter.

Arnold Beckman invented his first pH meter in 1934…

A bill sent by Arnold Beckman to W. E. Baier, covering the cost of a "glass-electrode apparatus," which was included in the first Beckman pH meter.

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

Directions for calibrating a McLeod gauge for use with the early model of the Beckman pH meter. This letter is likely related to the handwritten McLeod gauge diagrams and calculations also found in this folder. At the…

Response to an earlier letter from Dr. Duschak, asking if Dr. Beckman's new "acidimeter" would be appropriate for determining the pH of vegetable juices. Beckman describes some of the recent changes to the instrument,…

One of the earliest inquiries into using one of Arnold Beckman's newly invented pH meters.

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

Letter regarding the possible contents of and functioning of the glass electrode in the first pH meter models.

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

The McLeod Gauge measures very low pressures of gasses. Its presence in this collection indicates that it was used during the production of Beckman Instruments' early pH meters. These calibrations may have been written…

Duschak comments on the price of the pH meter (high, but in line with comparable instruments) and inquires whether or not the "acidimeter" could be sold again after his project is finished.

Arnold Beckman invented his…