What is it about?
The paper analysed the thermal linearity of linseed, that Newton used as a thermomemetric liquid in his thermometers. The properties of this thermometric liquid were not investigated. Now we know that Newton made a good choice and his observations were very precise.
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Why is it important?
Different thermometric liquids were used in early thermometers, e.g. water, spirit of wine (more or less ppoorly refined ethyl alcool including some water) quicksilver, linseed oil. Linseed oil had excellent thermal properties, but it did not become popular because it stuck to the sides of the capillary tube.
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This page is a summary of: The Newton linseed oil thermometer: an evaluation of its departure from linearity, Weather, March 2017, Wiley,
DOI: 10.1002/wea.2909.
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