36 



PHYSIOLOGY OK MIS( l.KS AND NT.UYFS. 



small plate soldered mi 1.) the surface of thederman 

 silver spring the currenl i> closed :nnl interrupted. A"n 

 ;i|)]):ir;itus of lliis kind is called a sliding inductorium. 

 It is only neees-ary to attach the ends of tin- mil / to 



the muscle, and to insert the chain between the columns 

 (/ ;ind //. The action of the hammer then at once 



commences; the inductive cur- 



rents n'eni -rat cd in < pass t hnm^h 

 the muscle, \vhich contracts te- 



tanically. 



Instead of connect \\\<^ coil c 

 immediately with the muscle-, it 

 is better to carry the wires from 

 the coil to the two clamps // and 

 c in the apparatus shown in tiij. 

 14, which is call, d a l< t<t H'IX'I n<i 

 ///. Two other wires pass from 

 t hese same clamj)s !> and r to the 

 muscle. Wlienthe induct i\'e ;i]>- 

 ]>arat us is in action the muscle is 

 put intoa tetanic condition. 1'ut 

 as soon as the lever </ is jiressed 

 down, so as to connect l> and c 

 together, the current of coil / is 



KM;. 11. TETASISINO KBY OF cnaliled to pass through this le- 



Di- i:<ns Ki vM(.\i.. ,.,, , , , - ~ 



ver. 1 he lever </ being made of 



a short and thick pice.- ,.(' l>ra<s, \\hich otVers hanllv anv 

 resistance to the current, while the nui-cle on the con- 

 trary of t'ers L,nvat re-i-taiice, \-ery little of the current 

 passes through the mu>ele, luit nearly all throiiu-h the 

 lever </. The muscle, therefore, remains at rest. As 

 soon, however, as the lever </ is a^ain raised, the in- 



duct i\ e current s must a^ain 



throuh the mu>cle. 



