ALCOHOLS AND FATIGUE PROCESSES 165 
Fig. 30. Apparatus. Primary current enters B, passes to Key ,C and Inductorium 
E. Wires D activate signal for “make and break” on E; while F connects with 
chronometer beating half minutes. Wires G are induction to muscle in J and lever 
M. K is slowly revolving kymograph. 
light muscle lever (H) as to allow the transcribing of a record on 
the kymograph (K) when the muscle was stimulated by the in- 
termittent induction shocks. Immediately above the muscle lever 
was mounted a Deprez double electric signal marker' (L), the 
upper marker being connected through wires ( F) with a Harvard 
type chronometer beating off intervals of a half minute ; the lower 
being connected through wires (D) with the primary circuit 
through a Harvard type vibrating interrupter beating seconds 
(a make and break during the second so that the muscle actually 
received through the inductorium two stimuli per second). The 
current used through wires (B) was from electric storage battery, 
type “D,” cells maintained approximately at full charge (1.225 
s.g.) delivering a voltage to the inductorium of about 2 per cell. 
Usually two cells were used to impel the induction coil of the 
interrupter, with one cell furnishing the current to the inductor- 
ium and the muscle which of course was connected to the induc- 
, torium through the terminals of the secondary coil. The second- 
ary coil in all experiments was placed over the primary so that 
it was two cm. from its fully closed position, thus delivering to 
the muscle its maximal induction. After extended preliminary 
experimentation it was found that about the optimum mechanical 
advantage in terms of leverage for the muscle lever consisted of 
having the muscle attachment 8 mm. from the pivotal fulcrum op- 
posed by a 30 gm. weight placed 14 mm. on the opposite side, the 
