Boston Public Library:
Power h'se exterior looking northwest
Boston Public Library:
Power h'se exterior looking northwest
Boston Public Library:
Looking east from SW corner of power h'se
Boston Public Library:
Looking west from constr. shaft concreting
Boston Public Library:
Free air side of bulkhead at ring 426
Boston Public Library:
Completed tunnel looking west sta. 18+0
Boston Public Library:
Tunnel lining looking west from ring 162
Boston Public Library:
Shield-shop assembly
Boston Public Library:
Shield erection construction shaft
Boston Public Library:
Power house interior looking west
Boston Public Library:
E. Boston vent shaft at [illegible] looking north
Boston Public Library:
Bracing of the E. Boston vent shaft looking west
Boston Public Library:
Const. shaft temp liner plates & shield
Boston Public Library:
South side of shield erecting ring no. 62
Boston Public Library:
Hydraulic equipt. power house
Boston Public Library:
Travelling platform and shield conveyors
Boston Public Library:
Shield entering East Boston vent shaft
Boston Public Library:
Boston vent shaft looking northwest
Boston Public Library:
Rear end of jumbo and belt conveyor
Boston Public Library:
Conveyor locks shop setup H. A. side
Boston Public Library:
Storage conveyor housing looking west
Boston Public Library:
Conveyor locks L. A. end shop setup
Boston Public Library:
Foot end of belt conveyor
Boston Public Library:
Form #2 concrete placing equipment
Boston Public Library:
Shield at sta. 21+35
Boston Public Library:
Concrete placers in F. A. duct sta. 14+00
Boston Public Library:
[illegible] of form no. 2 east [illegible] to form no. 3
Boston Public Library:
#3 concrete conveyor form no. 5, raised position
Boston Public Library:
No. 1 concrete conveyor in process of erection
Boston Public Library:
#4 concrete conveyor over completed ceiling
