IOWA ACADEMY OF SCIENCE 



117 





decay curves. To bring this point out more clearly, curve (f) has 

 been drawn. This curve is one connecting days' rest with the period 

 of the wire at a certain definite amplitude — in this case 40°. To fill 

 out the blanks in this curve, observations should be taken for the eighty, 

 and for the one hundred sixty days' rest. 



While the detailed study of this wire is of no great importance as 

 far as its own place in elasticity is concerned, still it is hoped that suf- 

 ficient information will be gained concerning its elastic behavior, so 

 that the properties of more ordinary wires may be more clearly grasped. 

 It is believed by the writer that all wires will be found to show these 

 properties, only most of them to a much smaller degree. In this case 

 we are, as it were, looking at the subject through a microscope. An 

 investigation of phospher bronze wires is to be undertaken in a short 

 time. 



