On the graduation of the thermometers supplied from the Kew Observatory for the use of the arctic searching expedition under Sir Edward Belcher | Zendy

John E. Welsh | Zendy

Open Access

On the graduation of the thermometers supplied from the Kew Observatory for the use of the arctic searching expedition under Sir Edward Belcher

Author(s) -

John E. Welsh

Publication year - 1854

Publication title -

abstracts of the papers communicated to the royal society of london

Language(s) - English

Resource type - Journals

eISSN - 2053-9134

pISSN - 0365-0855

DOI - 10.1098/rspl.1850.0067

Subject(s) - graduation (instrument) , thermometer , observatory , archaeology , geography , engineering , physics , astrophysics , mechanical engineering , quantum mechanics

These instruments were twelve in number, seven mercurial and five spirit thermometers, graduated for low temperatures. The processes adopted for the two kinds of instruments being different, I shall describe them separately. I. Mercurial Thermometers.—These were divided into degrees of Fahrenheit’s scale in the following manner:—The tube was first calibrated in the way already described in my former report on the construction of thermometers (dated March 22); marks being made on the tube at each extremity of the calibrated space.

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