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12 feet high 40-foot spar Annisquam River Bell Buoy Bell sounded blast 3 sec Boston Harbor Buzzards Bay Canal Channel Light Channel Buoy CHANNEL OAS Character and period conical tower cylindrical Depth mean low duration End Buoy F. W. TJ Flash 0.3 sec Flash 2 sec flat float Fog signal Gas Buoy ice runs iron spindle Island Channel last rebuilt Ledge Buoy Ledye Light Station Lighthouse Lightship lst-cl lst-cl.spar mark on aid mean low water Nantucket Sound Newburyport Harbor Peddocks Island period of light Plum Island Sound Point Buoy Red and black Remarks—Fog signal River Buoy Rock Beacon Rock Buoy Salem Harbor Shoal Buoy side of entrance skeleton super sounded by ac sounded by action southeast Southwest spar buoy substituted spar Red structure tion of sea Vineyard Sound visible 12 visible 7 miles visible 9 Wareham River Weir River Weir River Light Weymouth Back River White yards