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 Shield for tunnel under Beacon Hill for Cambridge Connection Shield for tunnel under Beacon Hill for Cambridge Connection Shield for tunnel under Beacon Hill for Cambridge Connection Shield to be used for tunnel under Beacon Hill for Cambridge Connection Part of shield to be used for tunnel under Beacon Hill Part of shield to be used for tunnel under Beacon Hill Looking south up Grove St. from Phillips St. Southeast corner of yard in rear of #50 Phillips St. Part of shield for construction of Tunnel under Beacon Hill Part of northerly side wall of single arch section of tunnel under Beacon H ill near Station 3+85 Beginning of single arch section of tunnel under Beacon Hill station 3+85 Unfinished northerly side wall of single arch section of tunnel under Beacon Hill Surface occupation at Ss.w. corner of Phillips and Grove St. Part of shield to be used in construction of tunnel under Beacon Hill Part of shield delivered at Phillips and Grove Sts. Part of shield to be used in construction of tunnel under Beacon Hill Looking northwesterly from shaft in Phillips and Grove Sts. Looking northwesterly from shaft in Phillips and Grove Sts. Two arch section under intersection of Phillips and Grove Sts. Surface occupation Phillips St. looking east towards Grove St. Side wall of tunnel in light well between #13 and #15 Grove St. Light well between #13 and #15 Grove St. showing side wall of tunnel Intersection of Grove and Phillips Sts. looking north Intersection of Grove and Phillips Sts. looking north Roof of tunnel in rear of #61 and #63 Phillips St., looking easterly Roof of tunnel in rear of #61 and #63 Phillips St., looking easterly 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