Density of Fluid Bismuth. 297 



If the weight and specific gravity of the ball be taken when 

 cold, we have, with the ordinate on the diagram at the moment 

 of immersion, sufficient data for determining the density of 

 the fluid metal ; for 



W~D'' 



the volumes being equal. And, remembering that 



"W (weight of liquid) = W (weight of ball) +x 



(where x is always measured as a + ve or — ve floating effect), 

 we have 



W 



The following table shows the results of six experiments 

 to determine the density of fluid bismuth made by the authors 

 in the laboratory of the Royal Mint. The bismuth was kept 

 just above its melting-point ; and this was ensured by placing 

 pieces of metal in the molten mass, which were observed just 

 to melt. 



No. of 

 exp. 



Diameter 



of ball, 

 in inches. 



Weight, in 

 troy ounces, 

 including 

 the stem 

 for attach- 

 ment. 



Specific gra- 

 vity of cold 

 ball, inclu- 

 ding this 

 stem. 



Floating 

 effect on 

 first im- 

 mersion, 

 in troy 

 ounces. 



Deduced 



specific gra- 

 vity of fluid 

 metal. 



Eemarks. 



1. 



2 



23-33 



972 



1-0 



10-13 | 



Bismuth ball 

 in fluid bis- 

 muth. 



2. 



2-25 



3346 



9-755 



1-3 



10-11 



do. 



3. 



do. 



33-37 



9-757 



0-6 



9-94 



do. 



4. 



do. 



33-53 



9-774 



0-7 



9-98 



do. 



5. 



do. 



22-184 



6-99 (iron) 



9-3 



9-92 j 



Iron ball in 

 fluid bis- 

 muth. 



6. 



do. 



22-184 



7-02 (do.) 



10-2 



10-25 



do. 





S 



pecific gravi 



ty of solid b 



Mean 



.. 10055 





ismuth 



... 9-82 



It will be seen that, considering the difficulties of manipu- 



