North bridge and statue of the "Minute Man" on old battleground, Concord, Mass.

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

Boston water works, Sudbury River Conduit, 1876, Section 10, Waban Valley bridge, view of centering "arch B".

Boston Water works, Sudbury River Conduit, Nov. 6, 1876, south end of wooden dam on Sudbury River showing R.R. bridge and small bridge used for taking experiments with current water.