THOMSEN, JULIUS.

Den electromotoriske Kraft udtrykt i Varmeenheder. (Extract from: Kgl. Danske Videnskabernes Selskabs Skrifter, 5te Række, naturvidensk. og Matem. Afdeling, 5te. Bind.).

(København, 1861). 4to. No wrappers. Uncut and unopened. Nice and clean. (3) pp. + pp. 156-175.

First printing of Thomsen's influential paper in which he "fund that the electromotive force can be used to calculate the mechanical work necessary for separating a compound into its elementary particles. In many instances, by measuring the electromotive force Thomsen obtained the same value for the affinity as in previous calorimetric experiments, but in other instances a difference was found. It is now known that the electrochemical measurements are theoretically correct, not the calorimetric ones." (DSB, XIII, 359 p.)

Order-nr.: 42732