Although the author is unknown, these instructions were most likely written by a Beckman Instruments employee. This glass electrode was used in Beckman pH meters.
Arnold Beckman invented his first pH meter in 1934 at…
These handwritten notes on glass electrodes appear to be signed Noel B. Brayman.
Glass electrodes were used in Beckman pH meters and various other instruments.
This series of handwritten and -drawn notes relates to the development of the Beckman DU-X2 spectrophotometer. One of the pages appears to be missing.
The first Beckman Instruments DU Spectrophotometer was developed in…
Handwritten and -drawn notes detail the resistors used in the Model F pH meter.
Arnold Beckman invented his first pH meter in 1934 at the request of a chemist from the California citrus industry, who needed an accurate…