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370 PAEIS UNIVERSAL 
Gas for the Park and the exterior of the Palace (which being 
closed at 6 o’clock did not require gas in the interior) was 
supplied from two huge gasometers, through 6,500 yards of iron 
pipe 19 inches in diameter, and 6,000 yards of smaller branch 
pipes, to the 600 lamp*post burners in the Park, the 800 
burners with glass globes suspended from the rim of the 
Palace awning, the 252 three-branched chandeliers that sup¬ 
plied the restaurants, and the multitude of burners for private 
use in the structures within the Park. 
Steam was furnished to the ponderous motors within the 
nave for driving the machinery there stationed, through un¬ 
seen pipes, by nine powerful generators stationed at regular 
intervals in the Park ; thus obviating the necessity for a spark 
of fire within the Palace. 
But the question of pure air for the hundreds of thousands 
of visitors who would throng the Palace was certainly not less 
important than a supply of water, gas and steam power. To 
make sure of this, the following extensive and very complete 
subterranean works were established, to wit: Underneath 
the 16 radial avenues and the 3 annular avenues there were 
made, by excavation, subterranean galleries 13J feet deep 
and around the whole of the exterior of the Palace an annular 
subterranean gallery 33 feet wide and I3J feet deep, divided 
by rows of pillars into three galleries, each about 9 feet 10 
inches wide, the outer one being completly separated from the 
other two by a wall. The two inner ones were cellars for the 
use of the restaurants, the outer one alone being a part of the 
system of ventilation. This outer gallery comunicated with 
the external air by means of 16 shafts, each 9 feet 10 inches 
in diameter, disposed symmetrically about the building and 
having their openings about 4 rods from the outer edge of the 
external annular promenade. 
In each radial subterranean gallery under the external 
wall of the building, was a jet or nozzle to be supplied with 
compressed air and having a flat end, with sector-shaped 
openings symetrically arranged around the center. These 16 
jets were so connected as to form four groups, each group 
