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21. Derrick car used for loading stone at the east end of Hoosac Tunnel 1864

22. Details of instrument houses used in surface alignment of the Hoosac Tunnel

23. Double house for Hoosac Tunnel laborers: walls were made 12 feet high instead of 10, as here shown

24. Drilling machine at heading

25. East end buildings : compressor house

26. East End: completed

27. East end, Hoosac Tunnel

28. East end: miners going in

29. East end of Hoosac Tunnel

30. East End: under construction

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

32. Elevation and some sections of the dam built in the Deerfield River to secure a water power for compressing air for the Hoosac...

33. Engineer Ellis' house, office, etc.

34. Engineer's office, east end

35. Fire at central shaft, 1867, when T.G. Mallory rescued miners

36. First automatic pneumatic rock drill used at Hoosac Tunnel

37. First class shanty built for Hoosac Tunnel laborers 1864

38. First pneumatic rock drill used at the Hoosac Tunnel 1865

39. Gardner, Mass., 1880

40. General arrangement of the hoisting & pumping machinery at the central shaft of the Hoosac Tunnel 1864