STEAM ENGINEERING BUILDINGS, BROOKLYN NAVY YARD 383 



on in panels or sections ; each is capable of being swung out to provide 

 ventilation. The side walls of the clerestory consist of corrugated iron 

 covering for the lower part, and glazing above. The bulk of the area 

 of the shed roofs is skylight, and wide skylights are also placed in the 

 clerestory roof. Fully 60 per cent of the area of the external walls 

 and roof is glazed. 



The large proportion of glazing to the total wall and roof area 

 makes the interior of the shops extremely well-lighted. The entire 

 glazing is on the Paradigm skylight and side light system and was 

 carried out by Arthur E. Rendle, of New York City, who controls the 

 system. 



The entire construction is of incombustible materials. There is no 

 wood used in the building, except for the body of the doors, and here 

 it is covered with tin plate. In this respect, and in respect to the amount 

 of glazing used, the buildings are somewhat remarkable, even among 

 modern shop buildings. 



Turning now to some of the special details, it will be noticed from 

 Fig. 181 that a somewhat unusual construction has been adopted for the 

 main columns. Each column consists of two main members, each com- 

 posed of two channels riveted back to back, the two main members be- 

 ing connected by double latticing. The resulting section is rather re- 

 markable for its length, as compared with its width, but its purpose 

 was evidently to give ample flexural strength to withstand eccentric load 

 of the bridge crane girders. Details of the crane girders and crane 

 tracks are shown by Fig. 181 ; there being one 40- ton crane and two 

 lO-ton cranes. It will also be observed from Fig. 181 that the lower 

 portion of the clerestory roof has a concrete and expanded metal cov- 

 ering with roofing slate nailed direct to the concrete. The concrete 

 is composed of Portland cement and cinder, and is $y 2 ins. thick. The 

 floor construction throughout will be 10 ins. of concrete covered with 

 I in. of granolithic or Kosmocrete. In the tool and testing rooms off 

 the machine shop, and between the boiler and erecting shops, an effort 

 has been made to secure a dust-proof construction, and a roof which 

 will be free from drippings due to condensed moisture. Over these 

 rooms the skylight roofs consist of double-glazed Paradigm skylights, 

 with a i -in. air space betwen them. 



