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XLV. On the Fluid Density of certain Metals. By W. Chandler 



Roberts, F.R.S. and T. Wrightson, Memb. Inst. C.E.* 



[Plate VII.] 



AT a Meeting of the Physical Society, on February 12, 

 1881 f, we communicated the results of certain experi- 

 ments, made with the aid of the oncosimeter, on the fluid 

 density of bismuth, in which we showed that the densities in 

 the fluid and cold solid states are respectively 10*055 and 9*82, 

 the fluid density thus being 2*4 per cent, higher than the cold 

 solid. These determinations correspond closely with results 

 that had been obtained by one of us, using the " cone" method 

 devised by Mr. Mallet^. For the sake of convenience we 

 here reproduce our results on bismuth. 



Weight, in 

 Biametev tr .°l m '} ces ' 



ex P L in inches. 1 the stem 

 tor attach- 

 ment. 



Specific gra-i 



vityof cold; 



ball, inclu- 



ding the I 



stem, i 



Floating 

 effect on 

 first im- 

 mersion, 

 in troy 

 ounces. 



Deduced ! 



specific gra-i 



vity of fluid 



metal. 



Eemarks. 



81. 

 32. 



33. 



34. 



35. 

 36. 



225 



do. 

 do. 

 do. 

 do. 



2333 



22-184 



33-46 



33-37 



33-53 



22-184 



■72 



1-0 



699 (iron) 93 



755 



9-75/ 



9-774 



1-3 



7-02 (iron), 10~2 



10-13 

 992 



1011 

 9-94 

 9-98 



10-25 



r \ Bismuth ball 

 j in fluid bis- 

 muth. 

 Iron ball in 

 I fluid bis- 

 J muth. 

 I Bismuth ball 

 in fluid bis- 

 muth. 



do. 



do. 



Iron ball in 

 fluid bis- 

 muth. 



Mean 



.... 10055 



Specific gravity of solid bismuth 



.... 9-82 



Since these results were published we have extended the 

 experiments to the following metals — copper, lead, tin, zinc, 

 silver. The results are now submitted to the Society. 



* Communicated by the Physical Society, haying been read January 

 28, 1882. 



t Proc. Phys. Soc. vol. iv. p. 195; and Phil. Mag. [5] vol. xi. 1881, 

 p. 295. 



\ Proc. Roy. Soc. vol. xxii. p. 366, and vol. xxiii. p. 209. 



