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Benjamin Thompson, Count Rumford.
PHD26A12_211

Benjamin Thompson, Count Rumford.

Electric energy. Electrical coil ( inductor ) by Ruhmkorff with Foucault switch " Physique
PHD26A13_266

Electric energy. Electrical coil ( inductor ) by R...

Aerial underground of Chicago - US
PHD26A07_125

Aerial underground of Chicago - US

Electric energy.Electrolysic of hydrofluoric acid. Fluorine insulation. " Physique populaire " by
PHD26A13_269

Electric energy.Electrolysic of hydrofluoric acid....

James Prescott Joule
PHD26A07_164

James Prescott Joule

Large eddy switch of Leon Foucault ( 1819-1868 ) french physicist ( electric energy ) and
PHD26A13_265

Large eddy switch of Leon Foucault ( 1819-1868 ) f...

Steam crane
PHD26A05_112

Steam crane