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East end of Hoosac Tunnel

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Dam in Deerfield River

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East end buildings : compressor house

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Thomas Doane's improved carriage for rock drilling machines

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Thomas Doane's improved carriage for rock drilling machines used at Hoosac Tunnel

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Clutch for attaching drill bar to rock drills used in the Hoosac Tunnel

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Rock drill invention by John Christiansen in connection with the Hoosac Tunnel

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First pneumatic rock drill used at the Hoosac Tunnel 1865

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First automatic pneumatic rock drill used at Hoosac Tunnel

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Plans numbered from 1 to 4 are details of Harsen's rock drill : with which the first experiments were made in the attempt to invent a successful rock drill for the Hoosac Tunnel 1864 Sheet 4

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Plans numbered from 1 to 4 are details of Harsen's rock drill : with which the first experiments were made in the attempt to invent a successful rock drill for the Hoosac Tunnel 1864 Sheet 3

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Plans numbered from 1 to 4 are details of Harsen's rock drill : with which the first experiments were made in the attempt to invent a successful rock drill for the Hoosac Tunnel 1864 Sheet 2

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Plans numbered from 1 to 4 are details of Harsen's rock drill : with which the first experiments were made in the attempt to invent a successful rock drill for the Hoosac Tunnel 1864 Sheet 1

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Plan of air compressor no. 2 designed for ventilating air at low pressure for Hoosac Tunnel 1865

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Elevation & section of air compressor no. 2 designed for ventilating air at low pressure for Hoosac Tunnel 1865

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Plan of air compressor no. 1 designed to compress air for driving rock drills in Hoosac Tunnel

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Thomas Doane's improvement in air pumps, patented December 31, 1867, used at Hoosac Tunnel

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Plan, elevation, and section of air compressor used experimentally at Hoosac Tunnel 1865

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General plan of guide frame for buckets at the central shaft of the Hoosac Tunnel

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Hoosac Tunnel Photographs

(112 items found)

East end of Hoosac Tunnel

Dam in Deerfield River

East end buildings : compressor house

Thomas Doane's improved carriage for rock drilling machines

Thomas Doane's improved carriage for rock drilling machines used at Hoosac Tunnel

Clutch for attaching drill bar to rock drills used in the Hoosac Tunnel

Rock drill invention by John Christiansen in connection with the Hoosac Tunnel

First pneumatic rock drill used at the Hoosac Tunnel 1865

First automatic pneumatic rock drill used at Hoosac Tunnel

Plans numbered from 1 to 4 are details of Harsen's rock drill : with which the first experiments were made in the attempt to invent a successful rock drill for the Hoosac Tunnel 1864 Sheet 4

Plans numbered from 1 to 4 are details of Harsen's rock drill : with which the first experiments were made in the attempt to invent a successful rock drill for the Hoosac Tunnel 1864 Sheet 3

Plans numbered from 1 to 4 are details of Harsen's rock drill : with which the first experiments were made in the attempt to invent a successful rock drill for the Hoosac Tunnel 1864 Sheet 2

Plans numbered from 1 to 4 are details of Harsen's rock drill : with which the first experiments were made in the attempt to invent a successful rock drill for the Hoosac Tunnel 1864 Sheet 1

Plan of air compressor no. 2 designed for ventilating air at low pressure for Hoosac Tunnel 1865

Elevation & section of air compressor no. 2 designed for ventilating air at low pressure for Hoosac Tunnel 1865

Plan of air compressor no. 1 designed to compress air for driving rock drills in Hoosac Tunnel

Thomas Doane's improvement in air pumps, patented December 31, 1867, used at Hoosac Tunnel

Plan, elevation, and section of air compressor used experimentally at Hoosac Tunnel 1865

General plan of guide frame for buckets at the central shaft of the Hoosac Tunnel

Arrangement of air compressor for west shaft