ANIMAL MECHANICS. 



35 



No. 5. — Mr. Samuel Haughton. 

 x = 8.2 in w = 0 lbs. 



a - 4.25 lbs. = 780 sees. 



Total work in ft. lbs. = 7062. 1 w. 



Combining together the previous results into one Table, 

 we obtain — 



Table V. — Work done by the Biceps humeri, Brachiaeus 

 (Brachialis anticus), and Supinator radii longus, employed 

 in holding the loaded Forearm horizontal, with the Palm 

 upward : — 





Time of Ex- 

 haustion. 



Total work 

 done. 



No. 1. 



480 sees. 



3854. Ou>. 



No. 2. 



360 ,, 



282. 90 „ 



No. 3. 



720 „ 



6003.3 » 



No. 4. 



555 „ 



4685-4 „ 



No. 5. 



780 „ 



7062. I „ 



Means, 



579 sees. 



4886-76 u). 



These experiments differ so much from those made on 

 the shoulder, both as to rate of work and amount of muscles 

 employed, that they are not directly comparable with them ; 

 still it may be useful to deduce from them a coefficient of 

 work per ounce per second. 



This coefficient, as well as those already given for the 

 shoulder muscles, is not constant, but varies with the rate of 

 work. 



The weight of the muscles employed in giving out this 

 quantity of work, previous to their exhaustion by fatigue, is 

 estimated, as before, by observations on the dead subject, and 

 D 2 



