PROPERTIES OF PHOSPHOR-BRONZK WIRES 



219 



"We may here note that the wires most eommonly employed 

 for suspensions are of a diameter in the neighborhood of the 

 smallest of these wires. 



Variation of Load and Period. The existence of these three 

 states in the wires and their causes and relations then became 

 the object of research. If the stairs existed, the wires of this 

 alloy certainly were not reliable for use in scientific instru- 

 ments. The question then arose as to whether the two varia- 

 bles, the period of vibration and the load supported by the 

 wires, might not be the determining factors of the resulting 

 state. 



It was soon discovered that ordinary experimentation did 

 not alter the condition of any sample of wire and so the experi- 

 ments could be repeated many times while the wire remained 

 in essentially the same state. It was found that unless the 

 treatments were quite strenuous, the wires always behaved 

 essentially the same. This was verified by repeating an experi- 

 ment several times in succession and the curves were always 



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identical. In one case wire No. 3 (d=.133 mm.) was used over 

 a period of nearly two months and the curves of this time are 



all of the same type. 



To answer the above questions of a varying period and load. 

 the following experiments were conducted: 



