Beacon St. mall, Boston Common Beacon St. mall, Boston Common Beacon St. mall, Boston Common Shaft #1 and Beacon St. Mall, Boston Common, Boston, Mass., October 5, 1910 Shaft #1 and Beacon Hill, Boston Common, looking southeast, Boston, Mass., October 5, 1910 Shafts #1 and #2, Boston Common, looking southerly, Boston, Mass., October 5, 1910 Shafts and overhead structure, Boston Common, looking east Shafts and overhead structure, Boston Common, looking west Shafts and overhead structure, Boston Common, looking north Shaft #2, Boston Common, looking northwest, Boston, Mass., October 5, 1910 Shaft #3, Boston Common, looking east, Boston, Mass., October 5, 1910 Shaft #3, Boston Common, looking northwest, Boston, Mass., October 5, 1910 Engineers' offices, Boston Common Engineers' offices, Boston Common Underpinning at Post Building Underpinning at Post Building Supporting a 30" water pipe over the tunnel during construction, looking n. w. Northerly drift, upper level, sta.21+50, sec.2, looking w. Northerly drift, lower level, sta.21, sec.2, looking w. Southerly drift, lower level, sta.20+50, sec.2, looking e. Heading and shield from upper deck Arch, looking east, sec.1 Upper level, sta.22+25, sec.2, looking east Bracing, southerly drift, sta.20+50, sec.2, looking east Open cut in Common west of Old Subway, looking northerly Showing west sidewall of Old Subway, drifts, bracing etc. Showing west wall of Old Subway and drifts, looking east Excavating in open cut just west of Old Subway Excavating and drift under Old Subway Excavating beside and under Old Subway for New Station Northerly sidewall duift under Old Subway showing timbering looking east Timbering under west wall of Old Subway Arch at sta.21+39.50, sec.2, looking westerly Southerly part of arch at sta.21+39.50 looking westerly Northerly part of arch at sta.21+39.50, sec.2 Bed of clear sand dividing mass of bolder, clay, till, sta.21+60, sec.2 Supporting a 30" water pipe over the tunnel during construction, sec.2 Building new station under Park St. station of Old Subway Arch lagging before waterproofing sta.22+50, sec.2 Southerly half of arch after removal of centers sta.21+20, sec.2 Excavating of the core of the tunnel, sta.20 B.H. tunnel, sec.1, sta.2+40, looking westerly Beacon Hill Tunnel, sec.1, sta.16-50, looking easterly North sidewall sta.21+11-12, sec.2 North sidewall sta.21+32-34, sec.2 Sec.1, BH Tunnel from sta. 17, looking westerly Sec.1, BH Tunnel from sta. 18, looking westerly Sec.1, BH Tunnel, looking westerly Tremont Street sidewalk from Hamilton Place to Winter Street, Boston, Mass., March 30, 1911 Part of shield to be used for tunnel under Beacon Hill
