BAIRD &TXTLOCK (LONDON) LTD. 



5630 



5630' 



Calorimeter, Fischer's improved new form, with silver vessel, lining of platinum and 

 silver, platinum gauze basket, steel mortar, normal thermometer o to 50 C in Whs 



ordinary thermometer .. (Subject to market price of platinum). Price about 15 5 



THE APPARATUS COMPRISES 



1. The calorimeter vessel, packed in eider down, and enclosed in an oak case 



2. Cover for the same carrying the stirrer and thermometer. 



3 Silver combustion chamber fitted with tight cover, carrying an inlet tube D, the upper part of which ends 

 n a g ass T tube. The outlet is either a spiral tube or a flat second chamber with a tube^unnW parallel to ?he 

 body from its base to the top of the apparatus, and, like the inlet, ending in a glass T tube through whtch a ther 

 mometer is inserted to control the temperature of the escaping gas. 



^ sma1 ' P Iatinum wire basket for holding the sample to be tested is carried in a thin sheet platinum cylindrical 

 ;ssel wl i fits on to the inlet tube of the combustion chamber by means of a tube attached to its silver cover. 



The sample is pressed into a cylindrical shape by means of the small steel mortar supplied, and placed in the 

 atmum basket. The carrier is fitted to the top of combustion chamber, and the cover made air and water-tight 

 by luting it with grease, and the chamber fastened to the base of the calorimeter by its tripod feet. The calorimeter 

 is filled with 1,500 cubic centimetres of water, and the cover placed in position. 



The stirrer is now worked until the thermometer (which is divided into tenths or twentieths of a degree 

 is also fastened to the cover) remains stationary. During this time a slow current of oxygen has been palsing 

 he combustion chamber, and as soon as the temperature is constant, the sample is ignited either bv elec- 

 :ity or by means of a small particle of incandescent charcoal. The current of oxygen is now increased to 2 to 4. 

 pW per nitrate. As the combustion approaches the finish, the amount is reduced to i litres per minute. This 

 three minutes, and about thirty seconds later the thermometer will be" at its maximum reading, 



particulars vide Zeitschrift fur Angewandte Chemie, 1892, p. 542, and Fischer 1 

 - xxi., 2nd edition, 1893, P- 63. 



^CHEMICAL AND SCIENTIFIC APPARATUS AND PURE CHEMICALS. 



1013 



