GAS SAMPLER. 



I2 9 



any air-bubbles. The tubes a and b have glass stop-cocks, 

 but the one in a may be omitted. The manometric tube c 

 shows the pressure. Tube d, like c, passes through a rubber 

 stopper, closing the horizontal tubulature of the gas-holder. 



FIG. 28. GAS SAMPLER. 



FIG. 29. SAMPLER TUBE. 



This tube can be rotated in the stopper to the position shown, 

 or to one 180 from such position. The flask is graduated on 

 the side into millimetres. Tube a fits the hole of the stopper 

 tightly, and can be moved up or down as desired to suit the 

 quantity of gas in the flask. All joints are covered with 

 paraffin, tube a being greased to facilitate movement. 



Fig. 29 shows the gas sampling tube. It consists of a 

 platinum cylinder, rs, 10 millimetres (0.4 inch) diameter and 

 700 millimetres (27.5 inches) long, having a longitudinal slot 

 of several centimetres length. The end r is closed with a 



