An attempt toward obtaining invariable measures of length, capacity, and weight, from the mensuration of time / [John Whitehurst].

  • John Whitehurst
Date:
1792?]
Catalogue details

Licence: Public Domain Mark

Credit: An attempt toward obtaining invariable measures of length, capacity, and weight, from the mensuration of time / [John Whitehurst]. Source: Wellcome Collection.

    11/86 (page 7)
    III, Experiments on Ignited Subjlances. By Mr. John IVhitehurJl, in a Better to James Stuart, Efquire, F. R. S. [From vol. 66, page 575 ; read May 25, 1776.] SIR, London, Nov. 29, 1775- np H E experiments of Mr. Buffon upon ignited bodies feem to prove, that, when heated to the degree he mentions, they are more ponderous than when cold. The experiments which I have made on heated metals, fogged a different idea, and contradict the faCt he relates; fo that I am induced to believe, that home circumdance, not attended to, has intro- duced a midake in the relation this learned philofopher has publifhed as the relult of his inquiry. His experiment dands thus recorded (Suppl. Nat. Hid. vol. 2, page 11): a mafs of iron, after receiving a white heat, weighed 49 pounds 9 ounces; when re- dored again to the temperature of the atmofphere 49 pounds 7 ounces. Hence he. concluded, that the igne- ous particles, contained in the heated iron, increafed its abfolute weight 2 ounces. O My