Sudbury River Conduit, B.W.W., div. 4, sec. 15, Sept. 13, 1876. View showing interior structure of Charles River Bridge over arches "F" & "G".

Sudbury River Conduit, B.W.W., div. 4, sec. 15, Sept. 13, 1876. View showing interior structure of Charles River Bridge over arches "F" & "G".

Sudbury River Conduit, B.W.W., div. 4, sec. 15, Sept. 13, 1876. Vie of centring of arch "A" (when almost completed) from east bank of river and looking down stream.

Sudbury River Conduit, B.W.W. Div.4, Sec 15, Sept. 13 1876, view of cutting of large arch taken from east bank of Charles River.

Sudbury River Conduit, B.W.W., div. 4, sec. 15, Sept. 13, 1876. View of centring of arch "A" taken from Ellis St. and looking north.

B.W.W. div. 1, sec A, Winter Street bridges and conduit below Dam I, and excavation for river wall, July 14, 1877.

Sudbury River Conduit, B.W.W. div.4, sec 15, Aug. 17 1876, view of Charles River bridges taken from Newton side and looking west.

Sudbury River Conduit, B.W.W. div.4, sec 15, Aug. 17 1876, view of Charles River bridges taken from Needham side, looking east.

Boston water works, Sudbury River Conduit, 1876, Division III, Section 10, Waban Valley bridge, south side of "arch A".