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Fred’s notebooks often contain fascinating lists of components and materials including this one for a battery from 1905.

It includes:

  • India rubber
  • Zinc discs
  • Copper ore
  • KHO (Potassium Hydroxide)
  • Hg (Mercury)
  • Tie wires
  • Paraffin wax

He also notes that

Zinc gives a definite “amp hourage” approximate to 2,000,000 ft lbs =  1 HP hour = 730 watt hours @ 2.4 300 amp hours

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