Board of Water Supply. City Water Tunnel No. 2. American Locomotive Company and American Manganese Bronze Company, contractors. View in the storage yard of Patrick McGovern, Inc., showing riser valves and three bronze shaft caps in storage prior to their installation in City Water Tunnel No. 2. July 8, 1931.

Board of Water Supply. City Water Tunnel No. 2. American Locomotive Company, contractor. A number of 72-inch riser valve pedestals, bodies and envelopes in storage at the yard of Patrick McGovern, Inc., in Long Island City. July 8, 1931.

Board of Water Supply. City Water Tunnel No. 2. Patrick McGovern, Inc., contractor. Hemispherical wooden form used for concreting. August 24, 1932.

Board of Water Supply. City Water Tunnel No. 2. Patrick McGovern, Inc., contractor. View of the Long Island City contractor's yard at Nott Avenue and Vernon Avenue. Showing construction of the wooden form used to make special parts of City Water Tunnel No. 2 where it transitions from a single 17-foot diameter waterway to two 66-inch sections. November 16, 1932.

Board of Water Supply. City Water Tunnel No. 2. Patrick McGovern, Inc., contractor. Hemispherical wooden form used for concreting. August 24, 1932.

Board of Water Supply. City Water Tunnel No. 2. Patrick McGovern, Inc., contractor. View of the Long Island City contractor's yard at Nott Avenue and Vernon Avenue. Showing construction of the wooden form used to make special parts of City Water Tunnel No. 2 where it transitions from a single 17-foot diameter waterway to two 66-inch sections. November 16, 1932.

Board of Water Supply. City Water Tunnel No. 2. Patrick McGovern, Inc., contractor. Special wooden form for construction of the concrete lining for tunnel. The form was completely erected in the contractor's yard and was built so that it could be taken apart in sections for transportation and handling. This photograph is a view of the form as erected in the contractor's yard and shows the circular and elliptical ribs covered with lagging of narrow wooden strips which were steamed and bent to the required curvature. March 25, 1932.

Board of Water Supply. City Water Tunnel No. 2. Patrick McGovern, Incorporated, contractor. View of the Long Island City contractor's yard at Nott Avenue and Vernon Avenue. Showing the wooden form used to make special parts of City Water Tunnel No. 2 where it transitions from a single 17-foot diameter waterway to two 66-inch sections. November 16, 1932.

Board of Water Supply. City Water Tunnel No. 2. Patrick McGovern, Inc., contractor. This special wooden form was assembled to construct the concrete lining where a 21-foot diameter shaft meets City Water Tunnel No. 2. It was built in the contractor's yard and designed so it could be taken apart in sections for transportation. Here the ribs are in place, to later be completely covered with wooden strips that were steamed and bent to the required curvature. This photograph is a view taken during the construction and shows only the circular and elliptical ribs which will later be completely covered with wooden lagging. March 10, 1932.