190 S&S Haughton—Mechanical Work done by.a Muscle. 
It is possible to calculate the coefficient of Refreshment from 
Professor Nipher’s experiments by the difference between a 
and a’. Thus, in his second series of experiments 
a— o/=7=2'50 kil. 5°51 lbs. 
This weight was lifted through 0°70 m=2:29 ft. in 125 seconds 
—the muscles having previously rested for an equal time. 
2 
Diagram III.—Prof. Nipher. Second Series. 
A, Asymptote w+a’=0; B, Asymptote n=0. 
(wta(’n=A. a’= —1°0 kil. A=582. 
Hence, in a cycle of rest and labor of 2°5 seconds duration, 
half of the time being devoted to rest, the work done, per sec- 
ond, is 
5°51 XK 2°29 
2°5 
et. assuming 34°5 oz.* of muscle employed, so as to reduce 
the coefficient to the units employed in my Animal Mechanics ; 
we fae finally 
5°51 XK 2°29 
Coefficient of refreshment=—=— _——— 
34°5 K 2°5 
=0°142 ft. lbs. per oz. of 
muscle per second. 
The coefficient of Refreshment* given, from totally different 
experiments, by me, is 
0°132 ft. lb. per oz. per second. 
* Principles of Animal Mechanics, pp. 482, 484. 
