On the Energy expended in Propelling a Bicycle. hil 
TABLE II.—Parrt I. 
Experiments made on Hills with the same Apparatus. 
No. of E E are Velocity | Coefficient 
Experi- “Stay, per macy we in Miles of Observations. 
ment. ues ees per Hour. | Resistances. 
(es | | Ee eee SS 
Up lower part of Dartry-hill, inclination slight 
G . 1 
oe 000 Osa oY BOW (1 in 48), surface rough ; calm. 
5) 1 
a Se Peer Ae gps Up hill at Landscape gate, inclination gentle 
oe , 204 (1 in 26), surface fair ; calm. 
35 57,600 10,000 10-4 qs g 
Up hill at Milltown Station, inclination consider- 
36 64,000 6,700 6 ies able (1 in 17), surface as smooth as a path ; 
calm, 
N.B.—The spring reached the end of its range 
in this experiment, so that the actual energy 
applied was somewhat more than that recorded 
here. 
Back pedalling down Classin’s Bridge hill, inclina- 
. 1 
eH SesMN Cae oe OS tion steep a in 103), surface rough ; calm. 
Cf 
In order to appreciate the foregoing results, it will be well to compare them with 
the annexed table of the foot-pounds of energy expended per minute when working 
with certain fractions of a horse-power. 
TABLE III. 
Foot-pounds per Equivalent Foot-pounds per Equivalent 
Minute. Horsepower. Minute. Horsepower. 
11,000 1 em 
[ga n 
goo | wie 
soe ees ao | 
en wo | & 
[aes] ie ee 
3,667 ae, | Daacee 
3300 | ae ae 
It thus appears that the power exerted in several of the experiments (see experi- 
ments 19, 22, 28, 31, 35) amounted to between a quarter and a third of a horse- 
