Engineering Towers

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Across
  1. 4. an underlying or supporting part of a structure
  2. 6. an extent, stretch, reach, or spread between two limits
  3. 8. an engineer whose training or occupation is in the design and construction especially of public works
  4. 9. a structure using triangles as supports
  5. 11. a structure built as a vertical extension of something else
Down
  1. 1. the part of a structure that receives thrust or pressure
  2. 2. a structure built with many supports connecting to different ends of the structure
  3. 3. the state of being pressed together
  4. 5. the act of being stretched to the condition of stiffness
  5. 7. a typically curved structural member spanning an opening and serving as a support
  6. 10. the wedge-shaped piece at the crown of an arch that locks the other pieces in place