XXV. On the variation of the temperature of boiling water

HE heat of boiling water having for fome years been uled as one of the terms for graduating the fcale ot thermometers; together with the particular attention the Society has lately given (vide the Report of the Com­ mittee, Phil. Tranf. vol. lxvii.̂ to this branch of inquiry, and I may add the fingular fuccefs with which this age and nation has introduced a mathematical precifion, hi­ therto unheai d of, into the conftru£iion of philofophical mftruments, will render it unneceffary for me to fay more in refpeft of the following experiments, than Am­ ply to lay them before the Royal Society. That the heat of boiling water was variable, accord­ ing to the preffure of the atmofphere, feems to have been known to Fahrenheit as early as the year 17 24^.