18 UNITED STATES NATIONAL MUSEUM 



pilasters on their outer faces, and the secondary cornice crowning the 

 attic is carried by smaller pilasters. 



The elevation of the ranges, but for the pilasters which are here 

 lacking, is identical with that of the east and west wings, except 

 above the cornice where the stone work is replaced by a slated man- 

 sard. The ranges are, therefore, subordinated to the wings as are 

 the wings tO' the main pavilion. 



All of the wings at their outer ends extend somewhat beyond the 

 line of the face of the adjoining ranges. In the case of the north 

 wing, which is mostly enclosed within the mass of the building, the 

 projection forms a secondary pavilion, 122 feet 9f inches wide and 

 23 feet 11 inches deep, with the middle part slightly recessed. This 

 pavilion is treated in a general way like the south front of the wings, 

 but as it is the central feature of the north side of the building and 

 contains another public entrance, here in the basement, it has been 

 worked out somewhat more elaborately, and the pilasters between the 

 large windows of the first and second stories are replaced by engaged 

 Tuscan columns. The projection of the east and west wings, which 

 is 125 feet 2 inches wide, amounts to 30 feet 11 inches. 



The heights above grade level of certain prominent structural fea- 

 tures are as follows: The floor of the south portico and the top 

 of the water table, 23 feet; the top of the entablature of the portico, 

 T9 feet, and of the pediments on the faces of the south pavilion, 124 

 feet 9| inches; the crest of the dome of the rotunda, 165 feet 2| 

 inches ; the top of the main cornice in the wings and ranges, 65 feet 



5 inches, of the stone work in the wings, 81 feet 10^ inches, and 

 of the stone work in the ranges, 71 feet 5 inches; the peak of the 

 roofs in the wings, 96 feet 4 inches, and in the ranges, 85 feet. 



The length of the south front of the building in the basement is 

 561 feet, of the north front, 499 feet 4 inches, and of the east and 

 west sides, 313 feet 2 inches. The projections at the center of the 

 north and south fronts increase the depth of the building to 364 feet 



6 inches, to which the approaches add TO feet 2 inches of stone con- 

 struction on the north and south axis. Slightly greater length dimen- 

 sions are furnished by the water table which projects 1 foot, and 

 by the cornice which projects 2 feet 4 inches, beyond the vertical 

 plane of the outer surface of the basement walls. The face of the 

 first and second stories, which is uniform throughout, is set back 

 1 foot from the face of the basement, and that of the attic story, 

 4 inches more. 



Below the level of the upper cornice of the wings the south 

 pavilion is fundamentally square in plan, and its extreme width, in- 

 clusive of its side walls, is 118 feet. The east and west wings, meas- 

 uring from these walls and including the thickness of their end 

 walls, are each 221 feet 6 inches long, although from the south their 



