Yonkers pressure tunnel fork, c. 1913. Part of the New York City water supply system.
Fullsize image: https://diqn32j8nouaz.cloudfront.net...l_fullsize.jpg
https://diqn32j8nouaz.cloudfront.net...ure_tunnel.jpg
Previously:
https://www.homemadetools.net/forum/...158#post168849
https://www.homemadetools.net/forum/...880#post171413
https://www.homemadetools.net/forum/...059#post172055

