88 UNITED STATES NATIONAL MUSEUM 



outlets in these are spaced at double the unit distance, namely 37 

 feet, and those of adjoining rows alternate. There is also a com- 

 plete crossrow at the outer ends of the east and west wings in the 

 first and second stories. These floor outlets are all opposite the 

 windows. 



The third story contains no wall or pier outlets, but floor outlets 

 extend in two regular rows, spaced 18^ feet apart, through each 

 series of rooms at the sides of the corridors. The outlets in one of 

 these rows are located close by the outer or court wall directly 

 at the side of each window, while in the other row they occupy cor- 

 responding positions with reference to the door openings. The light- 

 ing of the attic spaces is accomplished by means of wires from panels 

 on the third floor, which are carried through galvanized iron conduits 

 and distributed to meet the requirements. In addition to the dis- 

 tribution above described, wall outlets are also located in certain 

 dark places and on the walls of the stairs. 



Two kinds of floor outlet boxes are used. Those in the ground, 

 first and second stories are larger than the others and have a brass 

 floor flange the same as the junction boxes, but each cover plate is 

 drilled and tapped for four brass plugs. When connections are 

 made as many of these plugs as necessary are replaced by special 

 brass nozzles through which the electric cords pass. The floor out- 

 lets employed in the third story correspond with the wall and pier 

 receptacle boxes throughout the building. The cover plates of all 

 of these boxes are fastened to adjustable steel rims, and in the center 

 of each a slotted flange cap is screwed. Connection is made, after 

 the removal of the cap, by means of an outlet nozzle for holding in 

 place the special receptacle designed to make sliding electrical con- 

 tact within the boxes. All exposed parts of these fixtures are of 

 polished or white enameled brass. 



The wiring of the electric conduits has been carried only to the 

 extent called for by the present requirements. This includes con- 

 nections to all the ceiling outlets; to most of the wall and pier out- 

 lets in the east and west wings in the ground story, and to the wall 

 outlets in the rooms at the sides of the middle wing and the ranges 

 in the same story; to the pier outlets in the middle wing in the 

 first story for the lighting of the picture gallery; to the floor out- 

 lets along the outer and court walls in the third story, and to the 

 attic spaces. The wall, pier and floor outlets in the first and second 

 stories have been provided with reference to the special lighting of 

 exhibition cases, but the general illumination of the exhibition halls 

 is expected to be accomplished by means of the ceiling lights. 



Fixtures. — ^The ceiling fixtures installed in the first and second 

 stories and in the greater part of the ground story consist of a brass 

 chain about 3 feet long supporting an Alba glass shade specially 



