Reverse curve, Summerwell estate, sta. 3421.

Curve 16, sec. 7.

Boston water works, Sudbury River Conduit, 1876, Division 1, Section 1, conduit under Proctor + Albany railroad tracks.

Hydraulic mining - washing down the bank into the sluice.

Hydraulic Mining - washing down the bank into the sluice.

Hydraulic Mining, Cal.

Pipes that supply the water for hydraulic mining.