362 



Messrs, Roberts and Wrightson on the 



Lead. 



Three experiments were made with the oncosimeter, the 

 results being as follows: — 



No. of 

 expt. 



Diameter 

 of ball, 



in inches. 





Sinking 

 effect on 

 first im- 

 mersion, 

 in troy 

 ounces. 



Deduced 

 specific gra- 

 vity of fluid 

 metal. 



Remarks. 



43. 

 44. 

 45. 



83-37 



84-01 



10-7 

 10-8 

 11-07 



3-5 



3-25 



3-7 



10-25 

 10-38 



Lead ball in 

 fluid lead. 



do. 

 do. 

 10-5 \ Fluid lead 

 [ j getting cold. 



Mean 10-37. 



Specific gravity of solid lead ll - 4 



A mean of two experiments on lead, made on Mallet's 

 system, gave 10*65 as the liquid density, the results being 

 10*63 and 10*66 respectively. 



The diagram No. 1 (Plate VII.), gives the results of the 

 experiments on lead ; and the calculations of fluid density are 

 in each case attached, the point a indicating in each the 

 position taken as giving the true initial sinking effect at 

 the moment of immersion. 



Tin. 



Two experiments were made with the oncosimeter, with the 

 following results: — 



No. of 

 expt. 



Diameter 

 of ball, 

 in inches. 



Weight, in 

 troy ounces, 

 including 

 the stem 

 for attach- 

 ment. 



Specific gra- 

 vity of cold 

 ball, inclu- 

 ding the 

 stem. 



Sinking 

 effect on 

 first im- 

 mersion, 

 in troy 

 ounces. 



Deduced 

 specific gra- 

 vity of fluid 

 metal. 



Remarks. 



46. 



47. 

 48. 



3 



Failure. 

 3 



55-66 

 55-66 



7-165 



7-185 



1-1 

 1-2 



7-02 j 

 7-03 



Tin ball in 

 fluid tin. 



do. 





Mean .... 



... 7025 



















