formed hy Floating Magnets. 



163 



mercury small clean bicycle-balls are dropped, which imme- 

 diately fly to the centre and group themselves in the forms 

 figured by Mayer. It is essential that the mercury be filtered 

 immediately before use, as the slightest trace of film on the 

 surface causes lack of symmetry in the figures. 





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One disadvantage of the method is that it does not lend 

 itself to projection ; but by means of a mirror at 45° the 

 figures can be made visible to a fairly large audience : and 

 the neatness and despatch with which they form makes it far 



