BAIRD &TATLOCKL (LOM)ON) LTD. 



4730 

 4730 T Indiarubber Aspirating Pump, tor use with Orsat's Gas Apparatus 



INSTRUCTIONS. 



Fill the absorption pipettes with the requisite solutions (according to the gases to be estimated). The water 

 in the levelling bottle should be preferably saturated with the gas to be examined. 



Draw in a sample of gas so as to fill the burette, then pass it into the pipette containing caustic potash which 

 will absorb carbon dioxide (CO,). The cock on inlet of pipette can then be shut oft and the apparatus shaken. 

 The gas is then passed back into burette and the diminution in volume on remeasuring represents percentage 

 of CO,. 



If Instrument No. 4725 is used, the remaining examination is for oxygen (O.,), which is similarly ascertained 

 from absorption of the remaining gas by the alkaline pyrogallate solution. 



If Instrument No. 4726 is used, the remaining examination is for carbon monoxide (CO), which is similarly 

 ascertained from absorption of the remaining gas by the solution of cuprous chloride. 



(NOTE. It is better to use Instrument No. 4727 for this and pass the gas into two successive pipettes, one 

 containing fresh solution and the other used solution of cuprous chloride). 



If Instrument No. 4728 is used, the gas can be examined for H a S by means of a cadmium chloride solution 

 in the fourth absorption pipette. The hydrogen (H,) is ascertained by passing the residual gas over a tube provided 

 which contains palladium asbestos. 



Full details on all points are furnished with the apparatus, but the above condensed instructions will show 

 the simplicity of the use of Orsat Apparatus. 



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4731 



4731 T Taplay's Combustion Gas Analyser, as described below, complete (without mercury) 

 The apparatus illustrated above is a new, accurate and compact instrument for gas analysis by combustion 

 over copper oxide. It has been designed by Mr. J. G. Taplay and was described fully in the Journal of Gas 

 Lighting for April 23rd and April 3oth, 1912. It may be briefly stated that it is used for the accurate deter- 

 mination, by the combustion method, of hydrogen, methene, and nitrogen in gas mixtures ; for determining the 

 carbon density or value of hydro-carbons, and for ascertaining the volume of ethane in coal mine gas. 



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ICHEMICAL AND SCIENTIFIC APPARATUS AND PURE CHEMICALS- 



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