Pausilippo Tunnel

ancient tunnel, Italy

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In tunnels and underground excavations: Ancient tunnels
…25-foot-wide, 30-foot-high road tunnel (the Pausilippo) between Naples and Pozzuoli, executed in 36 bce. By that time surveying methods (commonly by string line and plumb bobs) had been introduced, and tunnels were advanced from a succession of closely spaced shafts to provide ventilation. To save the need for a lining,…
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