508 



Mr. H. Tomlinson. The Influence of 



In this experiment the numbers given for the load represent the 

 nnmberof kilograms on the end of the lever,* and, when multiplied by 

 4908, will represent the actual stress on the strip. After a rest of two 

 days with all the stress off, except that produced by the weight of the 

 lever itself,t the resistance had decreased, so that the sliding-piece 

 had to be shifted from 41 divisions to the right of the zero-point to 

 45 to the left, or through 86 divisions ; so' that the total permanent 

 increase of resistance was now represented by 87 divisions instead of 

 173 divisions. The strip was now tested again with the following 

 results : — 



Experiment III. 



Load. 

 = W. 



Position of 

 sliding-piece. 



Alteration of 

 resistance in 

 terms of the 

 divisions of the 

 platino-iridiuni 

 wire. — signifies 

 decrease of 

 resistance on 

 loading. 



Temporary 

 alteration 

 of 



resistance 

 = T. 



lotai 

 permanent 

 alteration 

 of 



resistance 

 = P. 



JL 



w 







45 left 







+ 87 





4 



48 „ 



- 3 



-*30 



+ 87 



-0-75 



8 



51 „ 



- 6-0 



- 60 



+ 87 



-0-75 



12 



51 » 



- 6 









16 



50 „ 



- 50 









20 



48 „ 



- 3-0 



-22-0 



+ 136 



-1-10 







26 „ 











20 



34 „ 



- 8-0 



-21 



+ 119 



-1-05 







13 „ 











20 



21 „ 



- 8-0 



-21-0 



+ 132 



-105 







„ 











20 



10 „ 



-10-0 



-20-0 



+ 142 



-1-00 







10 right 











20 



2 left 



-12-0 



-20-0 



+ 150 



-1-00 







18 right 











20 



8 „ 



-io-o 



-19-0 



+ 159 



-0-95 







27 „ 











20 



1? " 



-11 



-19 



+ 167 



-0-95 







35 „ 











20 





•• 





+ 175 









43",, 











* Including the weight of the scale-pan itself. 



f This was nearly equal to a load of 1 kilo, on the end of the lever. 



