Board of Water Supply. City Water Tunnel No. 1. Geological test borings on southwest corner of Clinton Street and Henry Street. Showing Keystone rig. October 6, 1910.

Board of Water Supply. City Water Tunnel No. 1. Geological test borings on Clinton Street and Madison Street. A drilling rig makes borings to discover geological conditions far below the pavement in preparation for City Water Tunnel No. 1. Borings are cylindrical samples that show the character of the rock underground. Gouverneur Hospital was built on this block in 1972. July 15, 1910.

Board of Water Supply. City Water Tunnel No. 1. Geological test borings. Camera at northeast corner of Clinton and Henry Streets, looking southwest. Drill rigs pull samples of rock out from deep underground in order to plan the path of City Water Tunnel No. 1, which was completed five years later. September 14, 1911.

Board of Water Supply. City Water Tunnel No. 1. Geological test borings. Camera at northeast corner of Clinton and Henry Streets, looking southwest. The Lower East Side's bustle carries on around drill rigs pulling samples of rock out from deep underground in order to plan the path of City Water Tunnel No. 1, which was completed five years later. September 14, 1911.