TY - PCOMM DB - Science History Institute DP - Science History Institute M2 - Courtesy of Science History Institute. Rights: In Copyright, D TI - Letter from Arnold O. Beckman to L. H. Duschak ID - k930bx099 AU - Beckman, Arnold O. DA - 1935/04/30/ YR - 1935 AV - Beckman Historical Collection, Box 14, Folder 8 VL - Beckman Historical Collection, Box 14, Folder 8 AN - Beckman Historical Collection, Box 14, Folder 8 UR - https://digital.sciencehistory.org/works/k930bx099 AB - Response to an earlier letter from Dr. Duschak, asking if Dr. Beckman's new "acidimeter" would be appropriate for determining the pH of vegetable juices. Beckman describes some of the recent changes to the instrument, leading to the model that will soon go on the market. Arnold Beckman invented his first pH meter in 1934 at the request of a chemist from the California citrus industry, who needed an accurate way to measure the acidity of his product. The resulting instrument kicked off rapid development not only of Beckman Instruments, Inc. but also of the electronic scientific instrument industry. KW - Hydrogen-ion concentration--Measurement--Instruments KW - Scientific apparatus and instruments KW - Scientific apparatus and instruments--Design and construction KW - Beckman Instruments, Inc. LA - English ER -