West by Southwest to Stickney

Chapter 5 Photos, 1–32

(photos 33–62 here)

Draining the Central Area

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Lake Claremont Press: A Chicago Joint

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Photo 5.21

February 15, 1935. The entrance to the air lock from the completed sewer for West Side intercepting sewer section 7. At right, the air-tight steel door is open for the photographer. Tunneling through soft clay required the use of an air lock to maintain increased air pressure at the heading. (MWRD photo 19352)