BAIRD &.TATLOCK (LOM)ON) LTD. 



5637 



Rosenhain's Improved Form of Thompson Calorimeter. 



The advantages claimed for the Rosenhain Calorimeter are : 



Accuracy. Practically complete combustion is secured, less than J % of the sample escaping combustion. 

 I When combustion is properly regulated no carbon monoxide is formed. When burning oils the saturated pellets 

 I burn completely and rapidly, thus avoiding the risk of some of the oil remaining unburnt in the absorbent pellet. 



Quickness. A determination of the calorific value can be made in little more than half-an-hour. The com- 

 bustion of 2 grammes of coal occupies about ten minutes. 



Safety. No parts of the apparatus are exposed to high pressure, and the risk of breakage is small. 



Small Cost of experiment. A comparatively small quantity of oxygen is required, and the only breakable part 

 is a glass chimney, which can be replaced by an incandescent gas-light chimney for a few pence. 



Ease of observation. As the sample burns under observation its behaviour as regards caking and clinkering can 

 be studied. 



No stirring required. The water is agitated by the gas bubbling through it. 

 5637 T Rosenhain's Calorimeter with accessories and simple thermometer 



Accessories. 

 5638 r Calorimeter with ball valve and brass vessel 



5639 r Coal Compressing Mortar 



5640 T Glass Measure, 1,000 cubic centimetres in 10 cubic centimetres 



5641 T Thermometer, 0-25 C. in T V C. . . 



5642 T Thermometer, 0-50 C. in f C. 



5643 T Silica Tray .... ...... 



9 14 3 



6 16 6 

 13 

 063 

 13 

 029 

 039 



(CHEMICAL AND SCIENTIFIC APPARATUS AND PURE CHEMICALS- 



1015 



