LSE4104839 Benjamin Franklin in his laboratory, observing the power of the spikes - in ??sLa physique populaire?????? by Emile Desbeaux, 1891 by French School, (19th century); Private Collection; (add.info.: Benjamin Franklin in his laboratory, observing the power of the spikes - in ??sLa physique populaire?????? by Emile Desbeaux, 1891); Photo ?? Leonard de Selva.