Roof of tunnel in rear of #61 and #63 Phillips St., looking southeasterly Roof tunnel in rear of #13 and #15 Grove St. Brick building with man Entrance to tunnel under Beacon Hill at rear of #13-#15 Grove St. Entrance to tunnel under Beacon Hill at rear of #13-#15 Grove St. South side wall of tunnel across Grove Place looking south Tracks and hoppers on bridge over Phillips St. Tracks and hoppers on bridge over Phillips St. Intersection of Phillips and Grove St. looking east along Phillips St. View from under raised passage way Tunnel under Beacon Hill for Cambridge Connection sta.5+20, shield Beacon Hill tunnel upper deck near shield Beacon Hill tunnel lower deck towards shield Beacon Hill tunnel shield Beacon Hill tunnel upper deck Beacon Hill tunnel lower deck torards shield Inside a tunnel lit with electric light and group of men in the background Shield at sta.8+41 Steel centers and shield from upper deck 125-127 Tremont Street, Boston, Mass. 125-127 Tremont Street. Boston, Mass. Northeast corner Tremont and Winter Streets, 129 Tremont, Boston, Mass., August 6, 1910 No. 128 Tremont Street, Boston, Mass., August 6, 1910 No. 134 Tremont Street, Boston, Mass., August 6, 1910 Nos.131-134 Tremont Street, Boston, Mass., August 6, 1910 No.124 Tremont Street, Boston, Mass., August 9, 1910 No. 134 Tremont Street, Boston, Mass., August 9, 1910 Site of open-cut, Boston Common looking n.w. Site of shaft, Boston Common looking s.e. Beacon St. mall, Boston Common 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.