Subject: Postal service--Metered mail - Science History Institute Digital Collections Search Results

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2 items
Business correspondence

Letter from Arnold Beckman to I. H. Lyons
- 1937-Aug-17
The letter discusses Beckman's scheduled meetings, marketing strategies for the pH meter, and interest in postal meters.

Arnold Beckman invented his first pH meter in 1934 at the request of a chemist from the…
- Addressee Lyons, I. H.
- Author Beckman, Arnold O.
- Subject Postal service--Metered mail, Hydrogen-ion concentration--Measurement--Instruments, Scientific apparatus and instruments, Hydrogen-ion concentration, Beckman Instruments, inc.