LUNGE'S IMPROVED APPARATUS 



three-way tube and rubber tubing, with very thick walls to safely 

 hold the mercury without expansion. In the middle of the meas- 

 uring tube A is a bulb of 70 cubic centimeters capacity. Above 

 and below the. bulb the tube is divided into tenths of a cubic cen- 

 timeter, and its diameter is such, viz., 11.3 millimeters, that each 

 cubic centimeter occupies a length of one centimeter. The upper 



Fig. 29. Lunge's Improved Apparatus. 



end of A is closed with a glass cock with two oblique perforations, 

 by means of which communication can be established at will, 

 either through e with the apparatus for generating the gas, or 

 through d, with the absorption apparatus, or the opening be com- 

 pletely closed. 



The volume of air under the observed conditions, which would 



