194 



Reports on Special Researches 



of air is through the entrance vestibules and the outlet bj' a special flue to the chimney-cap 

 50 feet above. A second room is also available in the space below the clock-room for work 

 requiring constant temperatures; it is thoroughly insulated by 13-inch brick walls on the 

 sides, lined with 3-inch hollow terra-cotta tile set in cement mortar, and these in turn plas- 

 tered over with three-fourths inch of plaster. The lower portion of the clock-pier passing 

 through this room serves for mounting any stationary apparatus. 



Onthebasevientfloor (Fig. 5) there is provision for a large instrument shop, dividing-engine 

 room, the woodworking shop, adjusting-room, and rooms for lacquering and soldering, the 

 two latter being provided with adequate means for ventilation to the roof. All of the walls, 

 except those of the lacquering, soldering, dividing-engine, and clock rooms, are unjjlastered, 

 the brick work being painted cream white with water color. Great care was used in all 

 shop rooms not to have the work-benches in contact with the walls. Each work-bench is 



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liintiiiiiiiMl 



Fig. 5. Plan of Ba-seuifut ui Mam Building. 



placed near a window and is su])ported not from the main wall, but from a reinforced-con- 

 crete wall which is a part of the sand-cushioned concrete floor. The reinforced-concrete 

 walls do not appear in the shop photographs (Plate 9), as they are hidden by shelving which is 

 utilized for storage of tools, etc. ; the benches and shelving are so fastened that at no place is 

 there possibility of contact from one to the other. The dividing-engine room is practically a 

 constant-temperature room; the walls are lined with hollow terra-cotta tile laid in cement 

 and plastered; all windows and doors are double. Special electric circuits and outlets are 

 provided in all the walls for uniform distribution of heating and illumination. The dividing- 

 engine and its motor are separately mounted on massive concrete piers built on 18-inch 

 sand-cushions. The tool equipment of the instrument shop is quite complete, including 

 universal milling machine, 16-inch engine lathe, 8-inch precision lathe, 3 bench lathes, 

 small Auerbach lathe, watchmaker's lathe, drill press, planer, dividing-engine for dividing 



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