Elementary lessons in magnetism |
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acid ball bar magnet battery brass cause charged chemical coil connected copper wire cork current of electricity cylinder disc discharge distance Earth Earth's magnetism elec electric current electric fluids electric spark electrical machine electrified body electro-magnet Electrophorus electroscope excited glass experiment flannel FRICTIONAL ELECTRICITY galvanometer glass rod glass tube heat horse-shoe magnet hydrogen inches insulated JEROME HARRISON kind of electricity knob Leyden jar light bodies magnetic force magnetic needle magnetic substances metal molecules N.-seeking pole natural magnet negative electricity neutral non-conductor North Magnetic Pole North Pole obtained outer coating oxygen pass permanent magnet piece of iron piece of soft pith-ball placed platinum polarity Pole attracts positive electricity prime conductor produced proof-plane repulsion round rubbed rubber sealing-wax shellac silk soft iron South Pole steel bar surface suspended thread tinfoil tion touch tricity true north two-fluid theory voltaic pile vulcanite zinc


