Contains research files. The subject of this series' records is on the development of Brown's measuring systems, covering a wide variety of technical and engineering aspects.

Arranged in fifty-two subseries. Each of the subseries is arranged and divided by the order of a number assigned by the company (i.e., 346/16). For this reason, the subseries Photoelectric Pyrometry appears twice due to the fact that each set of records is marked with different file numbers. Each subseries also contains similar types of documents, most of which are Engineering Department Records. Found here are interoffice correspondence, customer correspondence, articles, bulletins, studies, and various reports. This documentation provides information on the problem solving, engineering, and technical development that went into Brown's measuring systems.