ANIMAL MECHANICS. 



27 



No. 5. — Mr. Samuel Haughton. 

 a = 22 inches. w - o. 



a = 8.5 lbs. t = 525 sees. 



Total work in ft. lbs. = 4090.6 w. 



If we collect together into one Table the preceding re- 

 sults, we obtain as follows : — 



Table I. — Work done by the Shoulder Muscles employed in 

 holding the unloaded Arms in the horizontal Position , with 

 Palms upward : — 





Age. 



Weight. 



Height. 



Work done. 



Time of Ex- 

 haustion. 



No. 1. 



41 ys. 



126 lbs. 



67 inches. 



2887.5 w . 



420 sees. 



No. 2. 



25 » 



121 



70 „ 



336o.o „ 



480 „ 



No. 3. 



3° » 



120 „ 



651 „ 



3877.5 „ 



720 „ 



No. 4. 



24 „ 



144 „ 



69 „ 



2535-0 „ 



390 „ 



No. 5. 



17 „ 



123 „ 



68 „ 



4090.6 



525 V 







Means, . . 



3350-12 w. 



507 sees. 



The following experiments were then made on the same 

 persons, holding the arms horizontally, as before, with two 

 pounds weight in each hand, with the following results. The 

 times of exhaustion were found to be as follows : — 



1. Myself, 2co sees. 



2. Dr. Foot, 210 „ 



3. Captain Haughton, . . 300 „ 



4. Mr. Ormsby, .... 180 „ 



5. Mr. Samuel Haughton, . 240 „ 



Using these numbers in equation (7), and substituting 

 2 lbs. for w, and half the weight of the arm for a, we obtain — 



