IM'KX 



311 



Strutting : J-A;K 



Aiwtri in M.-tli..<l 1(8 



Baltimore Melt Line Tunnel ... 151 



Jli-lni.-iii M.-tli.nl 136 



Knxli.-h Method I .7 



(iiTiiian Method 146 



Iron : 



Full Section . . .... 52 



Headings 6a 



Shaft* 53 



Italian .M.-H....1 168 



Mont Ceuin Tunnel 91 



Quicksand Method 175 



Saint Gothard Tunnel . ... 116 

 Timber : 



Dimensions 50 



Face of Excavation 47 



Full Section 47 



Headings 44 



Quantity 60 



Shafts 48 



Tamping 29 



Timbering (See Strutting). 

 Tunnels : 



Classification of ........ 38 



Hard Rock 38 



LOOM SoU 39 



Open-cut 40 



Quicksand 40 



Submarine 41 



Historical Development .... ix 



Open-cat, General Description . . 180 



Relinlng of : 



Boulder Tunnel 280 



I. it 1 1. T.. MI Tunnel 286 



Mullan Tunnel 484 



Tunnels : (continued) > \<.\ 



Soft (j round : 



Austrian Method 162 



English Method 156 



(ii-noriil DiticuKMion 133 



German Method 145 



Italian Method 167 



Pilot Method 177 



Quicksand Method 173 



Submarine : 



East River Gas Tunnel ... 208 



Genera] Description .... 'J01 

 Milwaukee Water-Works Tun- 



nel 230 



Severn Tunnel 204 



Shield System, History of De- 

 velopment 242 



Van Buren Street Tunnel, 



Chicago 225 



Surface 183 



Under City Streets : 



Boston Subway 186 



General Discussion 184 



New York Rapid Transit Rail- 

 way Tunnel 192 



Tan Buren Street Tunnel, Chicago 225 



Ventilation : 



ArtittH.-il 2tC 



Boston Subway 191 



Mont Cenis Tunnel 92 



Natural 291 



Plenum Method 294 



Simplnn Tuniifl Ill 



Vacuum Method ....... 293 



Water, Presence in Tunnels ... T 



