ELECTRICITY AT THE WORLD'S FAIR. 723 



beneath, as the triangle is swung to and fro under the impulses of 

 an electro-magnet. The visitor will also have an opportunity to 

 examine the new telautograph of Prof. Elisha Gray, by means of 

 which the written word, it is promised us, may be transmitted to 

 a distance with the same facility that the spoken word now is by 

 telephone. Turning from this lighter and more delicate form of 

 apparatus, the visitor will find a very complete display of the 

 class of applications that has brought electricity into such close 

 contact with the daily life of the masses in recent years. From 

 the great Westinghouse lighting installation and from the power 

 plant of the intramural he will get some adequate idea of a mod- 

 ern central-station equipment, while from the illustration of long- 

 distance power transmission he will be able to comprehend one of 

 the directions in which electricity holds out the greatest promise 

 for the future. In the exhibits of electric welding and forging he 

 will learn of the help the electric current is giving to the metal 

 worker, and in that of cooking and heating the attempts that are 

 being made to displace with electrical appliances the kitchen 

 range and the hot-air furnace. 



The most prominent exhibit of electricity at the fair is un- 

 doubtedly the lighting of the Exposition itself. This is carried out 

 along lines already well established, and is remarkable chiefly for 

 the great scale upon which it is planned and executed. Nearly five 

 thousand arc lamps and a hundred thousand incandescents have 

 been called into requisition for the illumination of the grounds 

 and buildings. The placing of these required, no doubt, a great 

 deal of detail work and called for nice discrimination in adapting 

 means to ends, but involved no electrical problems of especial 

 novelty. The lighting of the big Manufactures Building, with its 

 thirty acres of main floor space and ten acres of galleries, pre- 

 sented the most difficult problem to the Exposition authorities, 

 but this has been successfully solved by the use of the arc lamp 

 hung from immense coronas along the central line of the build- 

 ing, supplemented by individual lamps in the corridors, galleries, 

 and separate rooms. The coronas are hung a hundred and forty 

 feet from the floor and sixty feet from the crown of the great 

 arched roof which spans the structure, and are of colossal size, the 

 central one being seventy-five feet in diameter and the two which 

 flank it on either side sixty feet. Something over four hundred 

 lamps are disposed of in this way, while to these are added some 

 twelve hundred more to complete the lighting of this great in- 

 closure. The incandescent, so flexible in the hands of the deco- 

 rator, has been used very effectively to outline the buildings and 

 the waterways of the Exposition, in addition to their use in in- 

 terior illumination. 



