A Zeiss Butter Refractometer : Notes from the Oesper Collections, No. 42, January/February 2017

The circa 1920 Zeiss butter refractometer recently acquired by the Oesper Collections.
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.