Boston Water Works, Chestnut Hill High-Service Pumping Station, 2450 Beacon Street, Boston, Suffolk, Massachusetts, USA.

• The station, in the Richardsonian Romanesque style of the period, was designed by City Architect Arthur H. Vinal (1854-1923) and completed in 1887. Oldest engine extant is the 1895 triple-expansion steam pumping engine designed by Erasmus D. Leavitt (1836-1916) of Cambridgeport, then one of the country's leading mechanical engineers. (The engine was designated a National Historic Mechanical Engineering Landmark in 1973).
• This image is part of the Historic American Engineering Record (HAER), created by the Library of Congress, and hence is in the public domain. Survey number: HAER MA-24.
• Jet Lowe, photographer, date of photograph unknown. See: http://hdl.loc.gov/loc.pnp/hhh.ma1196