PEOCEEDINGS 



OF THE 



ROYAL SOCIETY OF EDINBURGH, 



SESSION 1851-2. 



CONTENTS. 



Monday, \8t December 1851. 



PAGE 



1. On the Total Eclipse of the Sun July 28, 1851, observed 



at Goteborg ; with a description of a new Position Micro- 

 meter. By William Swan, Esq., . . .73 



2. On the Total Solar Eclipse of July 28, 1851, as seen on the 



west coast of Norway. By Professor C. Piazzi Smyth, 78 



3. On the Nature of the Red Prominences observed during a 



Total Solar Eclipse. By Professor C. Piazzi Smyth, 79 



4. Notice of some of the recent Astronomical Discoveries of Mr 



Lassell. By Dr Traill, . . . .80 



. Donations to the Library, . . . .81 



Monday, 15th December 1851. 



1. On the Centrifugal Theory of Elasticity, and its connection 



with the Theory of Heat. By W. J. M. Rankine, Esq., 

 C.E., ...... 86 



2. On the Computation of the Specific Heat of Liquid Water, at 



various Temperatures, from the experiments of M. Regnault. 



By W. J. Macquoun Rankine, . , .90 



3. On the Quantities of Mechanical Energy contained in a Fluid 



Mass, in different states, as to Temperature and Density. 



By Professor William Thomson, . . .90 



4. On a Mechanical Theory of Thermo-Electric Currents. By 



Professor William Thomson, . . .91 



[Turn over. 



