On the Energy expended in Propelling a Bicycle. 317 
T’o compare these results with those furnished by the indicator diagrams, it will be 
convenient to compute from Table IV. the energy per mile, the energy per minute, 
and the coefficient of resistances at a velocity of nine miles per hour, which was 
the average speed in the experiments recorded in Tables I. and II. We thus 
obtain results in the same form as in Tables I. and II. 
TABLE V. 
Results of the Kinetic Experiments for a velocity of nine miles an hour, 
No. of | Energy Energy Coefficient 
Experi- per per Velocity. of Observations. 
ment. | Mile. Minute. Resistances. 
32 to 36 20,268 3,040 9 sr On level footpath, in the direction ofa light wind. 
37 to 39 40,977 6,146 9 ied On level footpath, against light wind. 
40 to 46 26,568 3,985 9 dr On level footpath, without wind. 
AT to 62 28,818 4,323 9 a On good level road, without wind. 
These results are in substantial agreement with those of Tables I. and IL., though 
obtained by a wholly different method of observation. The problem has thus been 
worked out in three distinct ways which confirm each other. 
