188 Apparatus for performing electro-magnetic experiments. 
the circuit, were made powerfully magnetic, (so as to be 
suspended from each other ) . When the tube and spiral were 
placed perpendicularly, steel cylinders or bars inserted were 
supported entirely by the attraction ; one of these cylinders 
weighing 272 grains ; when the contact was broken, the 
cylinder fell from its gravity, but instantly rushed into its 
former place upon the contact being made. The copper 
plate conductor gave the north magnetic pole, and the zinc 
plate conductor gave the south magnetic pole. 
This apparatus, as might be expected, has no intensity as 
a chemical agent, not even giving a spark with charcoal. 
But an extraordinary proof of its low intensity, is, that leaves 
or laminae of the metals are not deflagrated, and very small 
portions of wire are ignited. 
