30" water pipe sec.4 subbway e. side Tremont St. between Boylston + LaGrange Sts. Looking northerly on sec.A, EBT, from Sumner St. Sec. A.E.B.T. looking northerly form Sumner St. Looking southerly on sec.A from top of arch near sta.2+14 Shaft of sec.B EBT near Webster St. Looking across shaft at northerly end of sec.B, EBT 30" water pipe in front of the Torraine looking south Looking southerly on sec.A, EBT from top of arch of exposed section Looking northerly on sec.A, EBT Looking northerly on sec.A, EBT Showing arch near Sumner St., E.B., looking south, sec.A, EBT Sec.A, Maverick Sq.- taken from west side Boilers for BSE in connectionwith air compressors on sec.B, EBT Excavating machine used in constructing sec.A, EBT Looking southerly on sec.A, EBT from bridge at Sumner St. Excavating machine, sec.A, EBT looking south Excavating machine, sec.A, EBT looking south Interior of sec.A, EBT looking north Incline sec.A, EBT Maverick Sq. View of 1/2 of rear end of shield for sec.B, EBT Changes in subway near Pleasant St. looking northerly Front view of roof shield for sec.B, EBT Changes in sec.5 showing bracing at southerrly end Bracing and new work southerly end sec.5, near Pleasant S, Tremont St. side Changes near Pleasant St. bridging under Shawmut Ave. tracks Changes near Pleasant St. showing new platform for elevated cars Showing excavating plant in use on sec.B, EBT Sec.A, EBT, looking south from Sumner St. Sec.A, EBT, looking north in Maverick Sq. from Sumner St. View of front end of roof shield for sec.B, EBT One half of front end of roof shield for sec.B, EBT Detail of interior of shield for sec.B, EBT Half of shield for sec.B EBT, front end Makinng preparation for lowering shield for sec.B, EBT Half view of front end of shield for sec.B, EBT View of interior of shield for sec.B, EBT Detail of interior of shield, looking through door in front end Bottom of trench seec.B, EBT lower part of shield and centering Railway form shaft of sec.B, EBT, to cars of B+M RR Centring under rear end of shield sec.B, EBT Work on sec.B, EBT, bottom of trench showing lower part of shield Elevator shaft and ry. trestle sec.B, EBT, looking south Elevator shaft and concrete mixer, sec.B, EBT View of compressor room, sec.B EBT Interior of sec.B, EBT at shaft looking north View of air locks sec.B, EBT from outside Looking towards shield from upper platform sec.B, EBT Showing steel ribs, tracks, and bottom of shield sec.B, EBT Looking easterly in Adams Sq. Connecting Washington St. tunnel with subway Haymarket Sq. looking south