Smithsonian Report, 1 91 3.— Walker and Bond, 



Plate 8. 



Looking Down the 441 -Foot Shaft at Reinforcement for the Caisson at Flat- 

 One HUNDREDAND FORTY-NlNTH STREET. BUSH AND THIRD AVENUES. 



Permanent Channel Iron Support for a Treacherous Roof. The Beams will 

 BE Imbedded in the Concrete Lining. 



