152 



CALORIMETRIC APPARATUS. 



6. M. Golaz also constructed for the author another apparatus 

 of a similar form, whoUy of platinum internally, Covered 

 externally with sheet steel. The screw and the tube which it 

 traverses are entirely of platinum, which allows of passin- 

 chlorine, and sulphuretted or acid gases through it. The con* 



Fig. 24. 



struction of this platinum 



Fig. 25. 



screw is a real masterpiece of 



execution. 



Fig. 24 is the drawing of this apparatus complete Fig 25 

 represents the receiver apart. Fig. 26, the cover fitted with the 

 closing screw. Fig. 27, the tightening piece, F F, of the cover 



Fig 26. Cover. Fig 27. Tightening piece. Fig 28. Auxiliary nut. 



Lastly, Fig. 28, the auxiliary nut E, fitted with two pins a, a', 

 for screwing up the preceding piece. This nut does not form 

 part of the apparatus immersed in the calorimeter. 



The second apparatus has an internal capacity equal to 

 247 cms., contains 662 grms. of platinum and 419 grms. of steel, 

 and is equivalent in water to 70*4 grms. 



Its dimensions have been arranged so as to make it act in the 

 calorimeter of 1 litre, containing only 550 grms. of water. 



7. By proceeding in this way, the elevation of temperature 

 may amount to 1'5 to 2'0. 



