ABSOLUTE THERMAL CONDUCTIVITY OF NICKEL. 



363 



product '000113 V 2 . This- correction seems to me to be probably too high for some of 

 the thermometers, but it is less than that which Dr Mitchell applied to the same ther- 

 mometers, viz., '00016 V 2 . The value of the stem correction which I have chosen is 

 based on the results of experiments to be described later in connection with the other 

 method of determining the conductivity. 



The dimensions, etc., of the bar were as follows : — 



Length of bar, . .-....• 



Mass of "bar, . . . . ... 



Diameter of bar, . .- 



Density of nickel, i.e., mass -r volume, . 

 Specific gravity of a small piece cut off, determined by 

 weighing in air and in water, 



128-5 cm. 

 19-28 kilo. 

 4-67 cm. 

 8'724 gms. per c.cm. 



8-75 



Distances of thermometer holes from one end of the bar : — 



Number of Hole. 

 1 

 2 

 3 

 4 

 5 

 6 

 7 



Distance to Centre of Hole. 



14-75 cm. 



23-02 



31-34 



39-73 



88-72 



97-02 

 105-26 

 113-59 



The statical experiment was frequently repeated at the same and different tempera- 

 tures, and the following table contains the readings chosen for calculation corrected for 

 stem exposure. On 6th August and the following days the bar was heated at the 

 opposite end to that at which it was heated on previous occasions. The table shows 

 that any effect due to tarnishing of the surface during the few weeks occupied by these 

 experiments is not noticeable. 









Numbers of Thermometer Holes. 









Date of 

 Experiment. 



















Temperature 

 of Air. 





















l 



2 



3 



4 



5 



6 



7 



8 





July 12 



150-5 



114-8 



90-2 



72-3 



28-9 



26-0 



23-2 



20-6 



20-2 



„ 13 



180-6 



135-0 



103-5 



81-7 



28'9 



25-4 



22-5 



19-7 



19-4 



„ 16 



181-7 



135-6 



104-4 



82-1 



29-3 



26-0 



22-8 



20-0 



18-8 



„ 17 



181-0 



136-0 



104-9 



82-8 



29-8 



26-1 



230 



20-0 



191 



„ 18 



181-6 



136-0 



105-2 



83-2 



30-1 



26-5 



23-0 



20-1 



19-3 



„ 27 



69-8 



57-0 



47-7 



40-8 



22-0 



20-7 



19-2 



180 



18-5 



„ 30 



116-7 



100-1 



72-8 



59-9 



26-5 



24-1 



22-0 



20-0 



18-9 



„ 31 



116-6 



99-9 



72-5 



59-6 



26-5 



24-4 



22-4 



20-5 



19-1 



August 1 



72 5 



59-4 



49-4 



42-3 



23-0 



2L8 



20-4 



19-0 



19-0 



„ 2 



67-5 



55-4 



46-8 



40-3 



22-7 



21-5 



204 



19-1 



18-6 



„ 3 



67-5 



55-3 



46-7 



40-3 



23-9 



23-0 



22-4 



21-9 



18-7 



» 6 



150-3 



114-2 



89-7 



71'3 



28-5 



25-7 



23-1 



20'9 



18-9 



„ 7 



198-8 



147-9 



. 113-8 



89-2 



316 



27-9 



24-5 



21-4 



19-2 



„ 8 



109-3 



85-9 



69-5 



57-0 



25-9 



23-7 



21-6 



19-5 



18-9 



„ 9 



70-0 



57-4 



48-3 



41-2 



22-8 



21-4 



20-0 



18-8 



18-3 



„ 10 



165-3 



124-9 



97-6 



77-6 



29-8 



26-6 



23-8 



21-1 



18-9 



„ 13 



163-5 



123-2 



96-0 



75-6 



28-3 



25-3 



22-7 



20-0 



18-4 



