toe 1 



BAIRD &. TATLOCK (LONDON) LTD 



4716 4717 



4716 Orsat's Gas Analysis Apparatus, with three absorption bulbs 



Consisting of a measuring tube holding 100 cubic centimetres graduated to 40 cubic centimetres in fifths, 

 which is connected by means of a capillary tube with branch taps with three absorption bulbs. The gas enters 

 through tube on the left and is measured. It is then passed into the furthest absorption bulb, which contains a 

 solution of caustic potash or soda. This absorbs the carbonic acid, and the gas is now measured and passed 

 into the second absorption bulb, which contains an alkaline pyrogallate solution, where the oxygen is absorbed. 

 After the gas is again measured it is run into the third absorption vessel, when carbonic oxide is removed by an 

 acid cuprous chloride solution. After the final measurement, the residual gas can be discharged into the air 

 through the spare branch of the horizontal tube, and a fresh portion of the flue gases admitted. See Galloway on 

 Fuel. 



4717 Gas Analysis Apparatus, Orsat-Lunge, for testing flue gases, with palladium asbestos 



tube, complete in portable box 



This apparatus consists of a measuring tube holding 100 cubic centimetres, graduated to 40 cubic centimetres 

 in fifths, which is connected by means of a capillary tube with branch taps with four absorption bulbs. The gas 

 enters through tube on the left and is measured. It is then passed into the furthest absorption bulb, which con- 

 tains a solution of caustic potash or soda. This absorbs the carbonic acid, and the gas is now measured and 

 passed into the second absorption bulb, which contains an alkaline pyrogallate solution, where the oxygen is 

 absorbed. After the gas is again measured it is run into the third absorption vessel, when carbonic oxide is 

 removed by an acid cuprous chloride solution, then, after measuring, the gas is passed into the fourth absorption 

 vessel, containing a 10 per cent, solution of cadmium chloride, which has been rendered slightly acid ; this retains 

 any hydrogen sulphide which may be present. Finally, if the presence of hydrogen is suspected, the gas may 

 be passed through the bent tube containing palladium asbestos, which should be slightly warmed by the spirit 

 lamp to facilitate absorption of hydrogen. 



After the final measurement, the residual gas can be discharged into the air through the spare branch of the 

 horizontal rube, and a fresh portion of the flue gases admitted. 



Price of spare parts for Nos. 4716-4717. 



4718 Capillary tube with five stopcocks for No. 4717 



4719 Capillary tube with four stopcocks for No. 4716 

 A4719 Burette with water jacket 



B4719 Absorbing vessel filled with glass tubes 

 C4719 Pressure bottle .... 

 D4719 Indiarubber bellows 

 E4719 Palladium asbestos tube . 



2 10 C 



3 15 ( 



CROSS STREET HATTOTST GARDETST, E- C 



856 



