Roof section after guniting
Guniting refers to the pneumatic application of portland cement mortar (gunite). Spraying gunite on the rock surface with a cement gun was done to improve support, make a smooth surface for air currents, and prevent weathering of the rock. This image may depict the construction of tunnels for New York City's water supply from the Catskill watershed. In 1905 the New York State legislature passed an act allowing the City to acquire lands and build water control structures in the Catskills for its water supply, including the East Delaware Tunnel, West Delaware Tunnel and the Rondout Tunnel (Delaware ...
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