CAPILLARY DIVER TECHNIQUE 391 



After the experiment the diver is inimediatcly removed from the 

 flotation vessel by filling tli(^ latter with water and pouring out the 

 water with the diver into a small cylinder. Using a microscope, the 

 lengths of Lj, Lo, and L-? are measured, taking the greatest distance 

 from meniscus to meniscus. The boundary between Li and P is not 

 a meniscus; hence there will he five menisci in a diver such as 

 that in A, Figure 134. 



(6) CALCULATION 



Considering the menisci to be hemispherical, the gas volume T 

 of the diver at the barometric pressure prevailing at the end of the 

 experiment is: 



V = {h + k + hUr-"- - -— 



o 



where I represents the length of L, and r is the radius of the diver 

 capillary. 



At the floating position the volume is F X B/B — P2) , where B 

 is the barometric pressure (mm. water) and {B — po) the final 

 equilibrium pressure observed. No correction for the height of the 

 rise of the medium in the diver capillary is necessary. 



When aP is the change in the equilibrium pressure (mm. w^ater), 

 the oxygen consumption (AT^) in a respiration experiment is: 



AP B 



AV = ——-■¥ 



10,300 B - p2 

 or corrected to standard conditions: 



Ap B B -p, 273 



av = • V 



10,300 B - p2 10,300 273 + / 



where {B — pi) represents the average pressure of measurement 

 during the given period. 



Usually the corrections are small enough to render it sufficient to 

 calculate the change in vol. by the formula: 



AV=V ^^ 



10,300 



where aV and V are given in microliters and p in millimeters water 

 per hour. 



