Oct. 31, 1877. View of connection of Sudbury River pipeline with 48" outer pipe at effluent gate house, of Chestnut Hill Reservoir, looking west.

Oct. 31, 1877. View of gates on Sudbury River pipeline below effluent gate house, Chestnut Hill Reservoir, looking south.

View of gates on Sudbury River pipeline below effluent gate house, Chestnut Hill Reservoir, looking south. Oct. 31, 1877.

Connection of the Sudbury River pipeline with 48" outer pipe at effluent gate house, of Chstnut Hill Reservoir, looking east. Oct. 31, 1877.

Sudbury River Conduit, B.W.W., div. 4, sec. 15, Nov. 13, 1876. Brickmason gang at the east end of section 16.

Sudbury River Conduit, B.W.W., div. 4, sec. 15, Nov. 13, 1876. View taken below bridge from Newton side, showing the six completed arches.

Sudbury River Conduit, B.W.W., div. 4, sec. 15, Nov. 13, 1876. View of south side of east abutment of arch "A", and of arches "C" and "D".

Sudbury River Conduit, B.W.W., div. 4, sec. 15, Nov. 13, 1876. View from inside of conduit; brickmasons at work in the east terminal chamber of bridge.

Sudbury River Conduit, B.W.W., div. 4, sec. 15, Nov. 13, 1876. South side of bridge from Newton side (centerings of arches "F" and "G" removed).

Sudbury River Conduit, B.W.W., div. 4, sec. 15, Nov. 13, 1876. View of south side view of arches "A" and "C" with centrings.

Sudbury River Conduit, B.W.W., div. 4, sec. 15, Nov. 13, 1876. View of south side of east abutment of large arch with half of arches "A" and "C".

Sudbury River Conduit, B.W.W., div. 4, sec. 15, Nov. 13, 1876. View of arches "A," "C," "D," and "E" with centrings from house above Ellis St.

Sudbury River Conduit, B.W.W., div. 4, Nov. 13, 1876. View inside of engineer's office at Newton Upper Falls, Mass.