Abstract
A FIRM of manufacturers of thermometers, Messrs. Pastorelli and Rapkin, Ltd., to which we submitted Mr. Hedger Wallace's inquiry, informs us that though they have supplied tens of thousands of dairy thermometers in recent years, they do not know the origin of the mark “churning at 62°,” and no one has ever suggested to them before that this temperature is incorrect. Dr. W. Goodwin, principal of the Midland Agricultural and Dairy College, has favoured us with the following opinion upon the subject:
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The Origin of “Churning at 62°” on Dairy Thermometers. Nature 107, 268 (1921). https://doi.org/10.1038/107268b0
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DOI: https://doi.org/10.1038/107268b0
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