From John Whitehurst
ALS: The Royal Society
Derby 15 Feby 1767
Dear Sir

We experienced a much greater degree of Cold at derby, in the late Frost, than perhaps was ever observed in England, and the quick transitions, were no less remarkable.

On Sunday the 18 of last month, at 7 o Clock in the evening. My thermometer stood at 20. At half an hour after Nine, nearly one degree below 0. At seven the next Morning 30. External Air. I hope to hear by Mr. Burdett, the bearer, hereof, that you are perfectly well and purpose honouring derbyshire with another Visit before you leave England. I beg my respectfull Compliments to Mrs. Stevenson and I am Sir your most Obedient Servant

John Whitehurst

Addressed: To / Docr. Franklin / at Mrs. Stevensons Craven / Street. Strand / London
Endorsed: No. 1
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