. The story of the exposition; being the official history of the international celebration held at San Francisco in 1915 to commemorate the discovery of the Pacific Ocean and the construction of the Panama Canal. THE THORDARSON TRANSFORMER. BATTLESHIP IN DRV-DOCK THE MILLION-VOLT TRANSFORMER 187 Spectacular demonstrations under this wire screen were carried onnightly, with two to three thousand people in attendance, each trying out theeffects of the electro-static charge in his own way. The voltage during thesestunts rarely rose over half a million. A number of secondary wires 10feet in length
. The story of the exposition; being the official history of the international celebration held at San Francisco in 1915 to commemorate the discovery of the Pacific Ocean and the construction of the Panama Canal. THE THORDARSON TRANSFORMER. BATTLESHIP IN DRV-DOCK THE MILLION-VOLT TRANSFORMER 187 Spectacular demonstrations under this wire screen were carried onnightly, with two to three thousand people in attendance, each trying out theeffects of the electro-static charge in his own way. The voltage during thesestunts rarely rose over half a million. A number of secondary wires 10feet in length were suspended in the air on slender wooden pieces, each beinginsulated from the rest. All of the wires became highly charged, and elec-tricity at a pressure of 75,000 volts would pass through the spectatorsbodies when within a few inches of contact. There were no bad results fromit because there was no energy from amperage within the secondary wires. These stunts were well enough to amuse the crowds; but the real business,or part of it, was to test and exhibit the insulator that should support thewire and hold the current on it in such a highly nervous condition as a millionvolts. For this purpose nothing better had been found tha
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