AUGUST 4 1883 THE TELESCOPE AT THE TROCADERO OBSERVATORY. unprecedentedly large. The prices obtained were enormous. Zinc Biende at Niagara Falls. THE TELESCOPE AT THE TROCADERO OBSERVATORY. PARALLELS FOR BALANCING PULLEYS ETC. English Torpedo Experiments. Canine Intelligence. IMPROVED PARALLELS FOR BALANCING PULLEYS ETC., scientific american, 1883-08-04
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