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whileft they are thus warmed you 

 apply them to filings or chips, a? 

 they call them, or thin fragments of 

 Steel or Iron, they will take them 

 up, as if the inftruments were touch- 

 ed with a Loadftone : but as they 

 will not do fo, unlefs they be thus 

 excited by rubbing till they be warm- 

 cd^ by which means a greater com- 

 motion is made in the inner parts 

 of he Steel fo neither would they 

 retain fo vigorous a Magnetifm 

 as to fupport the little frag- 

 ments of Steel that ftuck to them 

 after they were grown cold a* 

 gain. Which may be confirmed by 

 what., if I much mifremember not^ 

 I (hewed fome Acquaintances of 

 yours i which was, that, by barely 



rubbing a conveni- 

 EXPER. VI. ently f^aped piece 



of Steel againftthe 

 floor till it had gained a fufficient 

 heat, it would whileft it continu- 

 ed (6^ difcover a manifeft, though 

 but faint attra&ive power, which 

 vani(hed together with the adventi- 

 tious Heat* EX- 



