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The circa 1920 Zeiss butter refractometer recently acquired by the Oesper Collections.
Issue 42 describes a new addition to the museum’s refractometer collection – a circa 1920 Zeiss butter refractometer – and its historical importance as a means for rapidly differentiating between pure butter and margarine.
Click here for all other issues of Notes from the Oesper Collections and to explore the Jensen-Thomas Apparatus Collection.