Possible Clues:

• Perhaps Heathcliff's lines to his love, a source of electricity
• Pole getting charged — woman expected to be given a hearing
• Terminal dedication from Heathcliff?
• Perversely - and negatively - feline about the capital of Hungary
• The bits of the hat in negative code
• Her current poetry is all so negative
• Do cheat terribly where positive charges are brought
• Catherine makes nothing positive over the poem
• Conductor’s coat he’d ordered
• Do teach about part of an electrolytic cell