384 



GASOMETRIC-MANOMETRIC METHODS 



determining its length at different positions. Capillaries varying in 

 bore less than 2-3% and having lengths of more than 5 cm. should 

 be chosen. The inner diameter is finally measured by weighing the 

 mercury needed to fill the capillary completely. Divers are cut 5~6 

 mm. long, their length is measured, and then they are stored in 

 numbered test tubes. 



I 





^ 



Af2 = 0.80 mm. 



13 = 2.46 mm. 



PO2 = 0.02 mm. 



^=0.30 mm. 

 P0i=0.30 mm 

 P=0.40 mm. 



Li= 0.50 mm, 

 Mi = 0.90 mm. 



Fig. 134. 



1. The "standard diver": 

 length = 6 mm., 

 diameter = 0.17 mm., 

 gas space = 0.072 /ul. 



The data in the figure apply to 

 lengths of the individual spaces and 

 seals. 



2. Connecting piece between flotation 

 vessel and manometer. 



•S. The flotation vessel. 



From Zeuthen (1943) 



Cleaning the Diver. Zeuthen has given the following procedure 

 for cleaning the diver: 



1. Hold the diver in cork-tipped forceps under water and use a 

 thin glass rod to push out seals and air bubbles. 



2. Place the diver in a cylinder of glass-distilled water and suck 

 the diver into a pipette having an inside diameter of about 1 mm. 

 for a distance of 2-3 cm. from the tip, and a constriction at the 

 2-3 cm. point so that the diver cannot pass. Continue to draw water 

 up into the pipette in order to flush the diver which is held at the 

 constriction. 



3. Place the tip of the pipette at a slant against the bottom of 



