![U.S. conducts tests to improve acidity standards. Washington, D.C. June 16. At the National Bureau [of] Standards, Dr. Walter J. Hamer is making very accurate electrometric measurements on acidity standards. They are useful in the practical control of many processes such as electroplating, purificat](https://thumbs.arkivism.com/loc-2016871840.jpg)
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U.S. conducts tests to improve acidity standards. Washington, D.C. June 16. At the National Bureau [of] Standards, Dr. Walter J. Hamer is making very accurate electrometric measurements on acidity standards. They are useful in the practical control of many processes such as electroplating, purificat
From the collection of Library of Congress. Free to download, adapt and use — no permission needed.
Credit lineU.S. conducts tests to improve acidity standards. Washington, D.C. June 16. At the National Bureau [of] Standards, Dr. Walter J. Hamer is making very accurate electrometric measurements on acidity sta. 1937-01-01. Harris & Ewing. Harris & Ewing Collection, Library of Congress. Public domain.
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