Tentamen de vi caloris, que corpora dilatat ejusque dimensione
Year of Conception: 1752
Year of Writing: April-October 1753; August-September 1754
Year of Publication: 1755
Subject: Theory of Heat
Publication: Acta Helveticae physico-mathematico-anatomico-botanico-medica, Band II, 1755, pp. 172-242.(3)
First publication of Lambert, prepared by many experiments and written up for the Acta Helveticae. It treats the expansion of fluids and bodies under heat. A logarithmic curve fitting the expansion is derived, but many questions are left unanswered. These will be taken up later in Lambert's work on hygrometry and pyrometry.
Reviews: GGA 1755, 645-648(4)