Repoet of Board of General Managers. 89 



apparatus, from the smallest line insulator up to the largest electrical 

 dynamo in the world. It installed, with apparatus solely of its own 

 make, the famous intramural railway, which carried around the exposi- 

 tion as many as 150,000 people in one day. In the power house of this 

 railway were gathered examples of its different tyjjes of railway dyna- 

 mos, from the 200 kilowatt up to the large one above mentioned, four 

 sisters of which are now operating the Brooklyn street railways. 



In electric lighting, the exhibit proper comprised a complete history 

 of the evolution of the Edison incandescent lamp, showing, by concrete 

 examples, the thousands of experiments which its present perfection 

 necessitated. The tower of light, situated in the center of the Electricity 

 Building, and studded with thousands of lamps, which, lighted, formed 

 an apotheosis of electrical incandescent lighting ; an extensive exhibit of 

 all the many different electric lighting devices, such as cut-outs, 

 switches, regulators, etc. ; and a complete exhibit of different forms of 

 meters for measuring the amount of current consumed iu every kind 

 of work to which it has been applied, were notable. Prominent in the 

 latter group was the Thomson recording watt meter, which was awarded 

 the prize in France as better than any meter which the skilled elec- 

 tricians in Europe had been able to devise. 



In Electricity Building also the General Electric Company exhibited a 

 complete model arc lighting station, comprising many machines with all 

 the accessory appliances, driven by a 250 horse power motor, the largest 

 shown at the exposition. It also exhibited an immense arc lighting plant 

 for service purposes in Machinery Hall, which was used to illuminate the 

 groundd and the vast interior of the Manufactures and Liberal Arts 

 Building by means of the five great coronas of light suspended in the 

 arched roof. On the colonade, facing the Illinois State Building, was 

 set the great search light, with a mirror five feet in diameter, reflecting 

 a beam of light with an intensity of millions of candle power. In 

 Electricity Building, and on the top of the Casino and Music Hall, were 

 other search lights, fully equal in operation and workmanship to thp 

 productions of the best European workshops. 



Its mining exhibit comprised electric locomotives for mine haulage, 

 electric drills, both percussion and diamond, electric pumps, electric 

 ventilators, electric coal cutters, and other devices. Here, also, was 

 shown a complete power transmission plant, in which an electric pump 

 fed water to a Pelton water wheel, which turned a three-phase dynamo. 

 This in turn fed current to a bank of step-up transformers, which trans- 

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