CAPILLARY DIVER TECHNIQUE 



387 



1 mm. water replaces 0.75 mm. medium 



1 mm. paraffin or paraffin oil replaces 0.65 mm. medium 



Zeuthen (1943, page 501) employed the following example for a 

 diver having a diameter of 0.17 mm. and a charge as shown in A, 

 Figure 134: 



lo = 5.87 mm. 



/.If =: 2.15 mm. (calculated) 



P -\- POr = 0.54 mm. 



W = 0.26 mm. 



1/2 = 0.37 mm. 



PO2 = 0.05 mm. 



P + POi + PO2 = 0.59 mm. (which replaces 0.38 mm. medium) 



W — 0.26 mm. (which replaces 0.20 mm. medium) 



Total: 0.58 mm. medium 



Ml + Mz = 2.15 — 0.58 = 1.57 mm. 

 Ml chosen 0.82 mm. 

 il/2 chosen 0.75 mm. 



I 



M 



^ 



1 cm. 

 A 



1 cm 



I cm. 



5 r:im 



D 



Fig. 135. The techniciue of filling the diver. 

 Fro7n Zeuthen (19^) 



"The equilibrium pressure of the diver is here 1 atmosphere —12.5 cm. H2O. 

 Most frequently, however, it will be found that the equilibrium pressure at the 

 first filling of the diver is rather far removed from 1 atmosphere. When the 

 diver floats it is possible to measure Mi and M2 accurately at the equilibrium 

 pressure. The figures found in this way are used in calculating Mi and M2 at 

 the next filling. As a rule we find that the diver can be filled in such a way that 

 the equilibrium pressure at the beginning of the experiment is 1 atmosphere 

 ±40 cm. H2O (in recent experiments, though, 1 atmosphere ±20 cm. H2O)." 



