‎"RUMFORD, BENJAMIN COUNT.‎
‎An Inquiry concerning the Weight ascribed to Heat. Read before the Royal Society May 2, 1799.‎

‎London, Davis, (1799-1800). 8vo. Contemp. blue boards. Titlelabel with gilt lettering. Spine slightly rubbed. In: ""The Philosophical Magazine. By Alexander Tilloch"", Vol. V. - VI,422,4 pp. and 7 engraved plates. (Entire voulume offered). Rumford's paper: pp. 162-174. (November 1799). Internally clean.‎

Reference : 49294

‎Rumford's paper was published the same year in ""Philosophical Transactions"". His experiments with heat tried to show that heat is not a material substance, are famous episodes in the history of physics as they gave the death blow to the so-called caloric theory of heat.The volume contains also WILLIAM HERSCHEL ""On the nature and Construction of the Sun and Fixed Stars"", pp. 114-123 a. 222-232, originally published in the ""Transactions"" in 1794.‎