BAIRD &TATLOCK (LONDON) LTD. 



5631 



5631 Thompson's Ca'orimeter, or fuel tester. Apparatus complete, comprising ^ an iron 



pestle and mortar, fine mesh sieve, scales with gramme weights, box to contain " oxygen 

 mixture," spatula, cylindrical copper furnaces, spring clutch base to carry a furna.ce, 

 copper combustion cylinder, fitting the springs of the base, delicate thermometer, clearing 

 wire, and graduated glass cylinder. The whole fitted into a French polished, cloth lined, 

 mahogany case, with lock and key, and instructions 



Prices of Separate Parts. 



5632 Jars for above . . . . . . . . . . . . . . . . each 



5633 Clutch base . . . . . . . . . . . . . . . . ,, 



5634 Copper furnace tubes, brazed . . . . . . . . . . . . 



5635 combustion cylinder with stopcock . . . . . . . . . . ,, 



5636 Thermometer, o to 35 C., in metal protecting case 



DR. LEWIS THOMPSON'S SOLID FUEL CALORIMETER. 



Solid fuels are reduced to fine powder, and two grammes of the powder are intimately mixed with nitrate and 

 chlorate of potassium. The whole is placed in a cylindrical vessel of copper (called a furnace), and the latter 

 placed in the socket of a metal plate, which is furnished with springs which are capable of clutching the bottom 

 of a cylindrical copper bell, from the upper part of which extends a long pipe, closed by a cock. A fuse being 

 applied to the top of the material in the furnace and lighted, the bell is forced down upon the springs of the base 

 plate, and the whole immersed in a specific quantity of water which is contained in a long glass jar. Combustion 

 presently ensues ; and the whole of the heat evolved from the burning fuel is absorbed by the water and by the 

 apparatus. Temperatures are carefully taken before and after combustion, and the heating power of the fuel 

 deduced from the rise in temperature. The operations are not difficult ; and, when due care is taken, the 

 results are accurate. This apparatus is extensively employed by governmental authorities, and by some railway 

 companies, for the purpose of ascertaining the relative commercial values of the coaJs for which they contract. 



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CROSS STREET- HATTOIST GARDETST E-C 



1014 



