60 UKITED STAOiES NATIONAL MUSEUM 



the third story, it has been subjected to marked changes in the ground 

 storjj owing mainly to the fact that the latter has been adapted to 

 a greater variety of purposes. The corridors are generally 10 feet 

 wide, but in places their width is much greater, especially at the 

 outer ends of the wings and at elevator and stair landings. 



The spaces between the corridors and the outer and court walls, 

 subdivided by cross partitions into rooms, vary in width for the most 

 part to the extent of only a few feet, but in some places these pre- 

 vailing dimensions are greatly exceeded. The cross partitions are 

 spaced almost entirely on the basis of the 18^-f oot length unit, which, 

 except in the case of certain closets, toilets, etc., has been the smallest 

 dimension recognized in the subdivision. Nearly all rooms of greater 

 size than this are multiples of the unit as regards length, and since 

 the cross partitions start at the middle of the piers between windows 

 the arrangement insures a full window space for each unit and ren- 

 ders feasible any future subdivision of the larger rooms on the same 

 basis. In furtherance of this plan a door opening has also been pro- 

 vided in the corridor or corresponding partition opposite each win- 

 dow, and, with few exceptions, communicating doors between rooms 

 occur in the cross partitions, being placed in a line throughout each 

 corridor section, and, so far as possible, in positions to permit of the 

 economical installation of standard furniture. The corridor open- 

 ings generally are 3 feet 6 inches wide, but the communicating door- 

 ways and those leading into toilet and housekeeping rooms are only 

 3 feet wide as a rule. The customary height of the openings is T 

 feet. 



Ground story. — The partition walls in the ground story are almost 

 entirely of brick and 9 inches thick, but in a few connections terra 

 cotta has been used. The subdivision of the east range is typical. 

 The piers are on the court side of the corridor, being detached from 

 the corridor wall in the northern section, but in the eastern section 

 the wall is built between the piers near their inner edges. The room 

 spaces enclosed between the corridor and the outer and court walls 

 vary in width in different sections from 18 feet 1 inch to 23 feet 11 

 inches. The length divisions within these enclosures average large, 

 ranging up to six units which is the greatest length dimension in the 

 building under similar conditions. 



In the west range the corridor has been omitted, but the space on 

 the court side of the range has been enclosed by a continuous parti- 

 tion in the same manner as the corresponding part of the east range, 

 and the enclosed area has also been subdivided into rooms. Other- 

 wise the range has been left entirely open except for a small room 

 adjoining the north entrance lobby, a small compartment built at the 

 northwest corner of the range, and a vestibule at the entrance into 

 the west wing, in front of the freight elevator and service stairs. 



