iU 



Scientific Proceedings, Royal Dublin Society. 



The priuclple of the foUowiug method has beeu described by Prof. Joly iu 

 his original paper.' The aocompanyiug illustratioas show the latest desigu of 

 the instrument : — 



Fig. 1.— The Joly Meldometer. 



Fig. 2. — Diagram of the essential parts of the Joly Meldometer. 

 (Reproduced by permission of the Cambridge Scientific Instrument Company.) 



Tlie platinum ribbon, which is conveniently from 2 mm. to 4 mm. iu 

 breadth, is held between the forceps CC(fig. 2), which allow it to lie accurately 



' Loc. cit. 



