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  • All fields: 15.2 x 20.0 cm
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    • Testing acidity of milk, 1930

    • Dairying; Iowa State University;
    • This photograph, taken July 16, 1930, shows E.F. Goss, Associate Professor of Dairy Industries at Iowa State College (University) using the Nafis Acid Test to measure the acidity of the milk, an important part of the process in making cottage...
    • Making cottage cheese, 1930

    • Dairying; Iowa State University;
    • As one of the final steps in making cottage cheese, in this photograph, taken July 16, 1930, E.F. Goss, Associate Professor of Dairy Industries at Iowa State College (University) is shown adding salt to the curd to enhance its flavor.
    • Making cottage cheese, 1930

    • Dairying; Iowa State University;
    • As one of the final steps in making cottage cheese, in this photograph, taken July 16, 1930, E.F. Goss, Associate Professor of Dairy Industries at Iowa State College (University) is shown adding cream to the curd to enhance its flavor.

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