Electrical subways at the World's Fair

[Trade Journal]

Publication: The Electrical Engineer

New York, NY, United States
vol. 12, p. 379-280, col. 1-2,1



Steady progress on the electrical work of the World's Columbian Exposition is being made by the Construction Department and an excellent method of distribution of the conductors devased by the able electrical engineer of the department, Mr. Frederick Sargent, has been adopted.

The general plan of distribution embraces the utilization of the elevated railway structure which will run around the grounds, and the building of a tunnel or subway which will contain such wires and cables as are necessary to supply those buildings which could not be reached from the elevated structure.

It has now been decided to place the electrical generators in the Machinery Building and not in the Annex, as before proposed. The generating plant will he arranged along the south wall of Machinery Building, a space being reserved 850 feet long by 800 feel wide for that purpose; the engines being located near the wall and the dynamos towards the centre of the building. Behind the Machinery Building is a covered alley 80 feet wide; then comes the Boiler House, which will extend the entire length of the Machinery Building, and have a depth of 60 feet, the boilers being set towards the north wall and fuel being delivered at the south end of the house direct from the cars brought clear to the doors on a track running in the rear.

The conductors after leaving the dynamos will be arranged in a suitable fireproof rack located under the main floor about 150 feet from the south wall and running lengthwise of the building. From this rack five distinct groups of feeding wires will start as follows:

The first group will supply all the territory contained in the space bounded by 59th street on the north, centre of basin on the south, Lake Michigan on the east, and the lagoon on the west; also the electric fouutain, located at the west extremity of basin, and comprising the following: Fisheries Building, Government Building, Naval Exhibit, Manufactures and Liberal Arts Building, Electric Fountain and all the grounds within the territory. The main conduit for this group will be provided in the following manner: Starting from the rack already referred to in Machinery Building, a tunnel or subway will be constructed of sufficient capacity to accommodate 150 insulated cables or wires up to 600,000 circular mils area. The tunnel, which is shown in the accompanying engravings. Figs. 1, and 2, will run north from the rack under the floor of Machinery Hall to Electricity Building, with a tap for the electric fountain, the wires for which will be laid on the drawing-in system east from Electricity Building to the bridge, from the bridge to the Manufactures Building. From this point to the north end of the building, a fireproof conduit will be provided, which will gradually diminish in width as the wires are distributed. From the Manufactures Building to the Government Building and thence to the Fisheries Building the tunnel will be about three feet wide, with wires on one side only. The system will terminate at the Fisheries Building.

The tunnel itself, or any of the buildings through which it passes, may be tapped by the drawing-in system, buried in the ground wherever necessary to supply light or power to the grounds or any other buildings that may be erected in this territory. It will be constructed absolutely fireproof throughout. The crossarms will be made of iron provided with holes at suitable points to receive pins, upon which insulators of various form will be placed in the case of special insulators special forms of cross-arms will be provided where required.

Group No. 2 will be provided for in a tunnel of the same capacity as that for the first group, and will run direct from Machinery Hall to Electricity Building, with branch for the Mines Building and tap for the Administration Building. It will also provide for all grounds adjacent to these buildings, and probably include the wooded island.

Group No. 3 will run direct from Machinery Hall to the Elevated Road, and supply all territory north of the Basin and Administration Building not reached by groups Nos. 1 and 2, including Transportation Building, Transportation Annex, Service Building, Horticultural Building, Women's Building, State and Foreign Buildings, Art Gallery, Midway Plaisance and all grounds and smaller buildings in the territory mentioned. The drawing-in systems or buried conductors are to be used wherever elevated structure