NATURAL HISTORY BUILDING 51 



rooms at the sides of the entrance, but projecting slightly into the 

 interior of the pavilion. Its general interior dimensions are, width 

 11 feet 4 inches, depth 5 feet 7 inches, height 9 feet 8 inches. There 

 are double openings in the front and back, separated in both cases by 

 a central bronze mullion. Each of these openings is provided with 

 double push doors of plate glass framed with bronze, the leaves of 

 which are 2 feet 6 inches wide, their height being 7 feet. The remain- 

 ing height is occupied by a transom with its bar and by an orna- 

 mental cornice at the top. Each door has a 1-inch bronze push bar 

 3 feet 6 inches above the floor. The sides of the vestibule are of 

 marble paneled in bronze frames, with bronze register faces at the 

 top and bottom. The ceiling, framed by a bronze cornice, is glazed 

 with ground wire plate glass, divided into panels by bronze sash bars. 



Above the outer pair of doors and behind the iron gates and tran- 

 som, extending the full height and width of the masonry opening, is 

 a bronze frameAvork carrying ground plate glass in eight lights 

 across the width and three in the height. On the inner side above the 

 vestibule there is a ground plate glazed area, divided into eight 

 vertical lights by bronze muntins, occupying the remaining height 

 of the 16-foot opening. The glass has an etched ornament around 

 each light. 



Other doors. — The doors and trims of the small rooms on the south 

 side of the pavilion are of oak. In the first and second stories the 

 doors of the side rooms are double, and above them are two panels in 

 fixed frames, followed by a transom bar and glazed transom, with a 

 latticed wood grille in front of the glass. The two intervening doors 

 are single, with glass transoms, and this detail applies also to the 

 third story, in which, however, the larger side doors are similar in 

 treatment to the corresponding metal doors leading into the wings. 

 In the fourth story the doors of the side rooms are single. 



Of the openings between the wings and the pavilion only those in 

 the third and fourth stories are provided with doors, all of which 

 are of molded and pressed steel, in double leaves and paneled, and 

 have been introduced mainly to serve as fire checks. In the third 

 story the doors are 7 feet 8 inches high, the upper part of the 10- foot 

 6-inch opening being occupied by transom panels, also in two leaves 

 and hinged to open. In the semicircular-headed openings of the 

 fourth story the doors are of the full height of the openings. The 

 trims are also of steel. 



Pediment roofs. — On the east, west and north sides of the pavilion 

 the pediment roofs over the galleries of the interior are supported on 

 9-inch I beams, both ends of which bear on masonry walls. On the 

 south side, in view of the much greater width of the space between 

 the drum and the pediment wall, it has been necessary to introduce 

 an intermediate truss which spans a distance of 43 feet and bears 



