Model 3 Ph Electrometer
notes: label: Description
content: A pH meter measures the acidity of aqueous solutions. The first modern example was designed in the 1930s by the chemist, Arnold Beckman. This one was made by Coleman Electric in the 1940s.
label: Description
content: A paper label in the lid reads “Directions for Model 3 pH Electrometer.” The inscription on a metal label reads “INST No. 3305 / Model 3B / COLEMAN ELECTRIC CO., INC. / PAT. PEND. / MAYWOOD, ILL.” A metal tag on the front of the case reads “A GIFT FROM / WASHINGTON CHAPTER NO. 4 / WOMEN’S ORGANIZATION OF THE / NATIONAL ASSOCIATION OF RETAIL DRUGGISTS.”
label: Description
content: The Coleman Electric Company of Maywood, Illinois, was formed by Edwin Dewitt Coleman in the 1930s, made “precision tools for the technologist” during World War II, and became Coleman Instruments in the 1940s. Coleman submitted his patent application for this instrument in January 1939
label: Description
content: Ref: Edwin D. Coleman, “pH Measurement and Control Device,” U.S. Patent 2,311,976 (Feb. 23, 1943).
label: Location
content: Currently not on view
setName: label: See more items in
content: Medicine and Science: Medicine
creditLine: label: Credit Line
content: George Washington University, School of Pharmacy
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: MG.M-11108
label: catalog number
content: M-11108
label: accession number
content: 259201
objectType: label: Object Name
content: Electrometer
physicalDescription: label: Physical Description
content: metal (overall material)
label: Physical Description
content: plastic (overall material)
label: Physical Description
content: wood (overall material)