1382 F. E. Nipher— Work done by a Muscle before exhaustion. 
room. R is an iron rod for holding the apparatus in position. 
The weight is a bucket of shot, provided with a stiff bail and 
wooden handle, so that during the lifting ous na 
of the weight the line passing through "a 
the center of the hand and the center 
of gravity of the weight is a vertical. 
The experimenter stands to the right of 
the apparatus (as in fig. 2) and lifts the 
weight from the shelf B until his knuck- 
les touch the cord S. (Back of hand 
turned upward.) The beginning and 
close of this interval of work is marked 
by the sharp click of a metronome, the § 
time of whose beat is ¢ Atthe instant J 
when the weight has reached the high- 
est point, it is grasped by an assistant 
and lowered to the shelf, the arm of the 
experimenter being wholly relaxed, and 
resting upon the stiff bail of the bucket and the support D. 
day of experiment with a 5-0 kgrs. weight, and reduced all of 
the experiments to the mean strength, as shown by the constant 
experiment. In this series, a weight, w, was lifted through 4 
height, h=0°70 meters, in a time, 4, of 125 sec. The interval 0 
rest was also 1:25 sec. The experiments were so arranged as 
to make the constant experiment come, alternately, at 11 4. ™ 
and 4 p. M., the other experiments alternating in like manner 
The weight, w, was changed each day of experiment, so that 
in the table below the numbers on the horizontal lines ate 
arranged as observed, the order of time being indicated by the 
indices in the first vertical column. 
The columns headed c are the number of lifts n’ for the coD 
stant experiment w=5-00, he mean value of ¢ for é 
weights 3-0, 35, etc., 75, in all 100 experiments, is 35°79. er 
determinations of n for w=7% and 8-0 were consciously ba¢; 
