. 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. eans of little copper wires sheathed in black. The production of hydro-electric energy in California, and its deliveryat great distances, enabled the Exposition not only to dispense with asteam-power plant, but with an operating electric generating plant as well(although a Diesel engine on exhibition supplied some current), and evenenabled it to get along without a sub-station for the
. 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. eans of little copper wires sheathed in black. The production of hydro-electric energy in California, and its deliveryat great distances, enabled the Exposition not only to dispense with asteam-power plant, but with an operating electric generating plant as well(although a Diesel engine on exhibition supplied some current), and evenenabled it to get along without a sub-station for the distribution of electricenergy from the outside. It made the Palace of Machinery less astonishingin aspect, but more interesting in contemplation. It spelled a new chapterin mans growing control of the forces of nature. Steam was still his obe-dient giant, ready and reliable. But it was being broken to turning dynamos,through turbine wheels. And it did not enjoy a monopoly of that, evenwhere there was no water-power to dispossess it, for the internal combustionengine had arrived, and more dynamos every day were being turned bygas explosions, started inside cylinders by electric sparks; or by fuel-oil 158. (4 Ko< o TOOLS OF THE WORLD 159 sprays ignited by the heat from compressed air in the cylinders. Edisonhad even tried gun-cotton explosions, but was over-successful. The Corliss engine at the Centennial Exposition at Philadelphia was39 feet high and had a fly-wheel 30 feet in diameter. It had 27-foot walking-beams nine feet deep in the center, and weighed 1,400,000 pounds; and itturned up some 1,400 horse-power. It stood on a platform 59 feet in diam-eter, necessitated by the extension of the ladders built againstit to enable the engineers and wipers to ascend to the upper q^^ Timerstory; and some of the shafting it rotated was 350 feet long. The ladies standing about it, according to the pictures of that day, woreenormous bustles, and flounces on their overskirts, and wer
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