Central Shaft

Some articles on central shaft, shaft, central:

Hoosac Tunnel - Construction Technology
... Digging the Central Shaft also allowed workers to open 2 additional faces to excavate once the shaft was complete in 1870 workers dug outwards from the center to meet the tunnels being dug from the east and ... Engineers built a 1,000-foot (305 m) elevator to hoist the excavated rock from the Central Shaft ... east and west portal tunnels, and the two tunnels dug outward from the central shaft ...
Revolving Door - Construction
... Around the central shaft of the revolving door, there are usually three or four panels called "wings" or "leaves." Large diameter revolving doors can accommodate strollers and wheeled luggage racks ... Such enclosures can either be mounted at the central pivot, or attached to the revolving door wings ... Automatic revolving doors are powered above/below the central shaft, or along the perimeter ...

Famous quotes containing the words shaft and/or central:

    The subterranean miner that works in us all, how can one tell whither leads his shaft by the ever shifting, muffled sound of his pick?
    Herman Melville (1819–1891)

    Parental attitudes have greater correlation with pupil achievement than material home circumstances or variations in school and classroom organization, instructional materials, and particular teaching practices.
    —Children and Their Primary Schools, vol. 1, ch. 3, Central Advisory Council for Education, London (1967)