Physical (Jondants of ThaMluvi. 



195 



readings to resist ances, correction was made for the fact that 

 the middle point of the wire was not the electrical centre, 

 which was JJ-.S mm. to one side, and the resistances were 

 dirainislied by 1 j)er cent, of the cold resistance of the 

 thallium on account of the copper connections. Two inde- 

 pendent sets of observations were made, and from each the 

 coefficient at 20° 0. was calculated by the method of least 

 squares. The figures fi-om Avhich the calculations were made 

 are given in the annexed table : — 



The values of the coefficient from the above tables are 

 •00394 and 00400. 



Having determined these values by means of the slide 

 bridge, I proceeded to verify the result by measuring the 

 resistances with a resistance box, and shunt as described 

 above. Two independent sets of observations were made as 

 before. The observed values are oiven in the followincj 

 table : — 



Set 4. 



o 2 



