347 



> 



Fig. 5. 



a graduated gas-burette, h compensation -burette, с absorption-pipette, d index 

 of pressure, e, f, g three-way-taps; connection is established between the 

 burettes and the index of pressure, h screw for the final adjustment of the 

 pressure, г stand for the mercury-pipette, л\Ьеп the air has to be forced 

 into the absorption -pipette, к ditto, when the apparatus is closed, I air- 

 bubbles mixing the water-bath, m lens for reading the burette. 



