388 Benton— Properties of Catgut Musical Stri 



mgs. 



but again the state of affairs is complicated by after-effects. 

 These were simply neglected, however, and equations were set 

 up for the determination of the coefficient of expansion, using 

 eighteen observations ; solving them by the method of least 

 squares, the coefficient of linear expansion came out — 0*000081 

 per degree centigrade. The observations used are shown 

 graphically in figure 4. As the coefficient of expansion comes 

 out negative and larger in absolute value than for most sub- 

 stances, the question arises whether the data obtained were not 



Figure 5. — Elastic After-effect upon removing 0*5 kg. 

 6 



15 



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Figure 6. — Elastic After-effect upon applying 2*5 kgs. 



