312 



TRANSACTIONS OF SECTION I. 



of swimming. Two readings were taken : A, immediately after swimming 

 100 yards to the landing stage at the Bournemouth pier-head at a moderate speed — 

 viz.\ in 150 seconds ; B immediately after swimming 20 yards to the landing stage, 

 pulling my inert body in accordance with life-saving drill. The following are 

 the results : 



Resting CO2 = 3 c.c. 

 Net CO2 for normal swimming : 

 ,, in life-saving drill 



per sec. 



= 17 c.c. per sec. 



= 23 



It is nothing more than a pure coincidence that these values have come out 

 very nearly in the relation for time work and piece work in the case of the 

 labourer T.K. 



A second trial cai-ried out on the next day at rather higher speed gave rather 

 higher figures, but in the same ratio — 2 for simple swimming as compared with 

 3 for a life-saving swimming effort. 



Resting CO., = 3 c.c. per sec. 

 Net CO2 for swimming = 23 per se?. 



,, ,, life-saving — 30 „ 



Time of 100 yards = 145 sees. 



,, 20 yards (life-saving) = 35 sees. 



Objection has been raised to this method of work calibration to the effecfcl 

 that the calorific exchange value of CO, fluctuates with fluctuations of theJ 

 Respiratory Quotient CO^/O,. As a matter of fact this value is rather higherl 

 than normal during prolonged work, and does not sensibly fluctuate. If it did'l 

 fluctuate, it couid do so only within the following limits : 



Equivalence of 1 c.c. CO2 at R.Q. from 100 to 0-70. 



The factor X 20 used above for the conversion of c.c.'s CO, per second int 

 calories per hour postujates a C0,/0„ quotient = 0-91. The calibration of 

 labourer is essentially complete when his CO, ordinate has been recorded. Thd 

 00, per second datum is converted into calories per hour per individual by 



