PHOSPHOR BRONZE WIRES 
323 
marked as the wires were successively drawn down to smaller 
lengths. In these present experiments similar, though smaller 
effects were found, and for a sample set of experiments are 
shown in figure 23. The curve is practically self-explanatory. 
The coordinates are amplitude per cm. of length of the wire 
experimented on, and period of one semi-vibration. The num- 
bers on the curves from <2 to ^ indicate that we are dealing with 
a series of successive drawings, the succession of the drawings 
running inversely as the numbers. That is, number six is the 
largest wire experimented on, and number two the smallest. The 
Fig. 24. — Curves showing effect on wires of heating and long continued 
vibrations. 
