used at great expense owing to the special attendance requisite the electric motor will be invaluable. Elec tricity as a lighting agent has the great advantage over The great problem to be solved however by the duction of electrical energy from coal. The dream of To Make Watch Hands Red., scientific american, 1885-03-21
used at great expense owing to the special attendance requisite the electric motor will be invaluable. Elec tricity as a lighting agent has the great advantage over The great problem to be solved however by the duction of electrical energy from coal. The dream of To Make Watch Hands Red., scientific american, 1885-03-21
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