TOO 



RESPONSE IN THE LIVING AND NON-LIVING 



CHAPTER XII 



INORGANIC RESPONSE METHODS OF ENSURING CONSISTENT 



RESULTS 



Preparation of wire Effect of single stimulus. 



I SHALL now proceed to describe in detail the response- 

 curves obtained with metals. The E.M. variations 

 resulting from stimulus range, as has been said, from 

 4 volt to '01 of that value, according to the metal 

 employed. And as these are molecular phenomena, the 

 effect will also depend on the molecular condition of 

 the wire. 



Preparation of wire. In order to have our results 

 thoroughly consistent, it is necessary to bring the wire 

 itself into a normal condition for experiment. The 

 very fact of mounting it in the cell strains it, and 

 the after-effect of this strain may cause irregularities in 

 the response. 



For the purpose of bringing the wire to this normal 

 state, one or all of the following devices may be used 

 with advantage. (1) The wires obtained are usually 

 wound on spools. It is, therefore, advisable to straighten 

 any given length, before mounting, by holding it 

 stretched, and rubbing it up and down with a piece of 

 cloth.. On washing with water, they are now ready for 

 mounting in the cell. 



