21. There are three air shafts along its length. 22. A sheer undercurtain hides the air shaft view. 23. Air shafts are used on many converting machines.24. Ventilation is via air five air shafts . 25. The white pipe to the right is the air shaft used to get air to the miners. 26. At one point, he led the group through a pipelike air shaft near the top of the dam. 27. By using former air shafts the museum plans to enlarge and renovate its Thomas J . Watson Library. 28. Air shafts are constructed in longer " surangas " to supply fresh air and to expel poisonous gases.29. Remnants of the coal mine can still be found, e . g ., air shaft near old Grade School. 30. Tenement dwellers tossed garbage, bilge water and waste into these air shafts which were not designed for garbage removal.
