Natural bridge, looking down stream.

Natural bridge, looking up stream.

Stone dam at glan mill.

Hoosac house and mountain.

Prof. Mowbray's nitro-glycerine works at the west shaft, North Adams, Mass.

Railroad and river.

Hoosac Tunnel, west end.

Deerfield dam.

Hoosac mountain.

Entrance to tunnel, east end.

Entrance to tunnel, west end.

General view of the central shaft.

Entrance to central shaft.

Natural bridge.

Machine shop at east end.

Machine shop at east end.

East cascade.

Shelburne falls general view.

Shelburne falls rapids.

Shelburne falls rapids.

View of east end of tunnel looking out.

East end, October 1st, 1868.

East end, October 1st, 1868.

West end as it appears from the original standpoint, looking north-east.

Central shaft 583 feet deep, showing new buildings.

View of the cascade 200 feet high, 1-4 mile up the creek, to the right of the mouth of tunnel at east end.

View of the cascade 125 feet high, 1-4 mile up the creek, to the right of the mouth of tunnel at east end.

View of the cascade 125 feet high, 1-4 mile up the creek, to the right of the mouth of tunnel at east end.

View of dam at foot of cascade, 1-4 mile up creek.

View of dam 1-4 mile above machine shop.