Essays and observations on the construction and graduation of thermometers, and on the heating and cooling of bodies / By George Martine, M.D.

  • Martine, George, 1702-1741.
Date:
1787
Catalogue details

Licence: Public Domain Mark

Credit: Essays and observations on the construction and graduation of thermometers, and on the heating and cooling of bodies / By George Martine, M.D. Source: Wellcome Collection.

    187/192 (page 177)
    an iron rod in rapefeed oil fo boiling as to be rea- dy to burll into flame to its elongation in boiling ^vater, as 201 to 53, and confequently as 682 to 1 80 : fo that, if the mercurial 'I'hermometer had been capable of being lengthened out far enough, this boiling oil would have raifed the mercury in it to gr. 682+32=714 ; and tlwt is a heat in the ordinary way of reckoning from above the freez- ing point, (^1^3:^), near four times greater than that of boiling water. It is true, a much lower heat made a fort of boiling noife and froth in the oil, arifing from the expulfion of its more watry parts. This came on when the iron rod was lengthened but 120 parts, and that lights about gr. 440 in our Thermome- ter. But this is but an accidental and indefinite fort of heat, and not at all to be reckoned the complete boiling flate of the oil, or the greateft heat it is capable of without burning. FINIS,