174 



THE HUMAN MOTOR 



The increase of work with variation of speed was : 



These results confirm those obtained for motive work. Speed 

 appears again as a dominating factor in the economy of energy. 



From the above we can deduce the expenditure per kilo- 

 grammetre. This is : 



cu. cms. cu. cms. cu. cms. cu. cms. 



With increasing load ... 9-90 9-80 10-30 10-40 



speed ... 10-20 8-50 8-09 7-50 



There is a minimum expenditure with a weight of 3 kilo- 

 grammes. 



Calculating the economy in the transport of a load to a given 

 depth, we find ; for a load of 6 kilogrammes and a depth of 17-60 

 metres : 



cu. cms. cu. cms. 



If the transport is effected in a single journey 277 X 4 = 1,108 

 by fractions of 1-500 kg. 804 



The difference 



represents : 



308 



304 



= 27% approximately of the total expenditure. 



Comparing motor and resistant work it will be seen that 

 the expenditure in the former case benefits less by the speed than 

 in the latter. This has already been pointed out, but is here 

 clearly exemplified. 



119. Voluntary Work. The accurate and ingenious experi- 

 ments of Chauveau have shown the extreme importance of the 



