CALORIMETRIC BOMB. 



151 



The cover carries laterally an insulating ivory fitting traversed 

 by a platinum wire,//, which is fitted with a small screwed 

 portion, which holds it in the ivory. By this wire the electric 

 spark is made to pass. 



In every experiment, before closing the apparatus, a small 

 mica disk, pierced in the centre, is fitted to the surface of the 

 ivory to protect the latter from the flame of the explosion. 

 The gases are introduced at the outset, and extracted at the end 



Fig. 23. Bomb suspended in the calorimeter. 



by the aid of a mercury pump, combined with an apparatus 

 similar to Eegnault's eudiometer, but greater in capacity (half a 

 litre) ; this introduction being effected through an orifice, p, 

 which can be stopped at will by the screw W, fitted with a 

 head and a channel KK'. 



Fig. 23 shows the calorimetric bomb in place inside the 

 calorimeter, with its supports and the glass three-way cocks for 

 operating it. 



