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ions with the centre; central section, 95 feet long, 72 feet high; pavilions, 45 feet long, 60 feet high; arcades, each, 90 feet long, 40 feet high. · The front or south face of the central section displays a rise of thirteen steps to the entrance, 70 feet wide. The entrance is by three arched doorways, each 40 feet high and 15 feet wide, opening into a hall. Between the arches. of the doorways are clusters of columns terminating in emblematic designs illustrative of science and art. The doors, which are of iron, are relieved by bronze panels, having the coats-of-arms of all the States and Territories. In the centre of the main frieze is the United States coat-of-arms. The main cornice is surmounted by a balustrade with candelabras. At either end is an allegorical figure representing science and art. The dome rises from the centre of the structure to the height of 150 feet from the

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ground. It is of glass and iron, and of a unique design; it terminates in a colossal bell, from which the figure of Columbia rises with protecting hands. A figure of colossal size stands at each corner of the base of the dome. These figures typify the four quarters of the globe. Each pavilion displays a window 30 feet high and 12 feet wide; it is also ornamented with tile-work, wreaths of oak and laurel, 13 stars in the frieze and a colossal eagle at each of its four corners. The arcades, a general feature in the old Roman villas, but entirely novel here, are intended to screen the long walls of the gallery. These each consist of five groined arches. These arcades form promenades looking outward over the grounds and inward over open gardens, which extend back to the main wall of the building. These garden-plats are each 90 feet long and 36 feet deep, ornamented in

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Height of Picture fastenings above floor line 23 feet 4 inches.

Galleries A, B, C, D, F, G, N, are lighted from above.

Rooms H, I, K, are repeated in the second story, and are 14 feet from floor to ceiling throughout.

Rooms E, H, I, K, L, M, are lighted from the side.

Height of Pavilions and Reception Hall 52 feet.
Height of Centre Hall 77 feet.

the centre with fountains and designed for the display of statuary. A stairway from the gardens reaches the upper line of these arcades, forming a second promenade, 35 feet above the ground. Its balustrade is ornamented with vases, and is designed ultimately for statues. The cornices, the atticas and the crestings throughout are highly ornamented.. The walls of the east and west sides of the structure display the pavilions and the walls of the picture-galleries, and are relieved by five niches designed for statues; the frieze is richly ornamented; above it the central dome shows to great advantage. The rear or north front is of the same general character as the main front, but in place of the arcade is a series of arched windows, twelve in number, with an entrance in the centre; in all thirteen openings above, in an unbroken line, extending the entire length of the structure. Between the pavilions is the grand balcony-a promenade 275 feet long and 45 feet wide and elevated 40 feet above the ground, overlooking northward the whole panorama of the Park grounds. The main entrance opens on a hall 82 feet long, 60 feet wide and 53 feet high, decorated in the modern Renaissance style. On the farther side of this hall three doorways, each 16 feet wide and 25 feet high, open into the centre hall; this hall is 83 feet square, the ceiling of the dome rising over it 80 feet in height. From its east and west sides extend the galleries, each 98 feet long, 84 feet wide and 35 feet in height. These galleries admit of temporary divisions for the more advantageous display of paintings. The centre hall and galleries form one grand hall 287 feet long and 85 feet wide, capable of holding eight thousand persons-nearly twice the dimensions of the largest hall in the country. From the two galleries doorways open into two smaller galleries 28 feet wide and 89 feet long. These open north and south into private apartments which connect with the pavilion-rooms, forming two side galleries 210 feet long. Along the whole length of the north side of the main galleries and central hall extends a corridor 14 feet wide, which opens on its north line into a series of private rooms, thirteen in number, designed for studios and smaller exhibition-rooms. All the galleries and central hall are lighted from above; the pavilions and studios are lighted from the sides. The pavilions and central hall are designed especially for exhibitions of sculpture.

MACHINERY BUILDING.

This structure is located west of the intersection of Belmont and Elm avenues, at a distance of 542 feet from the west front of the Main Exhibition Building and 274 feet from the north side of Elm avenue. The north front of the building will be upon the same line as that of the Main Exhibition Building, thus presenting a frontage of 3824 feet from the east to the west end of the exhibition buildings upon the principal avenue within the grounds. The building consists of the main hall, 360 feet wide by

1402 feet long, and an annex on the south side of 208 feet by 210 feet. The entire area covered by the main hall and annex is 558,440 square feet, or 12.82 acres. Including the upper floors, the building provides 14

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acres of floor space. The principal portion of the structure is one story in height, showing the main cornice upon the outside at 40 feet from the ground, the interior height to the top of the ventilators in the avenues being 70 feet and in the aisles 40 feet. To break the long lines upon the exterior, projections have been introduced upon the four sides, and the main entrances finished with façades, extending to 78 feet in height. The east entrance will form the principal approach from street-cars from the Main Exhibition Building and from the railroad dépôt. Along the south side will be placed the boiler-houses and such other buildings for special kinds of machinery as may be required. The west entrance affords the most direct communication with George's Hill, which point affords the best view of the entire exhibition grounds.

Ground Plan.-The arrangement of the ground plan shows two main avenues 90 feet wide by 1360 feet long, with a central aisle between and an aisle on either side. Each aisle is 60 feet in width; the two avenues and three aisles making the total width of 360 feet. At the centre of the building is a transept of 90 feet in width, which at the south end is prolonged beyond the main hall. This transept, beginning at 36 feet from the main hall and extending 208 feet, is flanked on either side by aisles of 60 feet in width, and forms the annex for hydraulic machines. The promenades in the avenues are 15 feet in width, in the transept 25 feet and in the aisles 10 feet. All other walks extending across the building are 10 feet in width, and lead at either end to exit doors.

Construction.-The foundations consist of piers of masonry. The superstructure consists of solid timber columns supporting roof trusses, constructed with straight wooden principals and wrought-iron ties and As a general rule, the columns are placed lengthwise of the building, at the uniform distance apart of 16 feet. The columns are 40 feet high to the heel block of the 90-feet span roof trusses over the avenues,

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GROUND PLAN OF MACHINERY BUILDING.

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