443 
1910-11.] An Apparatus for inducing Fatigue in Wires. 
and clamped there, is fixed a V-shaped brass-toothed wheel R, which works 
into either of two smaller circular wheels of the same material attached to 
the brass rod terminating in the clamp A. One of these wheels has a 
circumference double that of the other, so that the pointer on A can be given 
a single or double revolution. B is another clamp which is movable along 
a brass rod W fixed at one end on the table. The rod to which A is fixed 
can be shifted, by means of a catch, so that the V-shaped toothed wheel can 
fit into another smaller wheel on it, and so produce larger oscillations when 
