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

Air locks sec.B,EBT from inside compressed air

Looking southerly on Lewis St. showing paving

Paving on Lewis St. near Marginal St., E.B.

Looking northerly on Lewis St E.B. showing settlement

Showing commotion in water caused by leakage of air from sec.B, EBT

Showing settlement of Lewis St. over sec.B, EBT looking northerly

Buildings on south side of State St. near Atlantic Ave.

Showing condition of pavement n.e. corner of Washington + Hanover Sts.

Northeast corner Hanover St. and Washington Sts., looking easterly, Boston, Mass., November 4, 1901

Completing ventilating chamber corner of Hanover and Washington Sts.

Completing ventilating chamber sec.10, showing street occupation

Excavation on south east side of Lewis St.

Excavation for building opposite plant of sec.B, EBT, s.e. side of Lewis St .

Jacking up sec.B shield for removing shoe

Jacking up sec.B shield for removal of shoe

Bottom of roof shield sec.B showing showing broken plate

State St. looking e. from w. of Chatham and showing street blocked on account of changing pipes

State St. at India St. looking towards Atlantic Ave.

State Street at India Street looking west from east side of Commecial Street, Boston, Mass.

Looking west on State St. from easterly corner of Commercial St.

Space occupied by beams piled on west side of Custom House, India Street, Boston, Mass.

Showing relative positions of irongate and field office commercial

State Street from westerly steps of Custom House, Boston, Mass.

Sec.B, comparative tests of concrete for different mixtures