yard ▁was ▁established . ▁Unfortunately , ▁competition ▁from ▁other ▁glass - making ▁cent res ▁led ▁to ▁a ▁decl ine ▁in ▁orders ▁and ▁the ▁bott le works ▁closed ▁in ▁ 1 8 7 2 . ▁The ▁last ▁bott les ▁to ▁leave ▁were ▁on ▁the ▁' Un ity ▁of ▁Boston ', ▁bound ▁for ▁the ▁Channel ▁Islands . ▁A ▁few ▁years ▁later , ▁in ▁ 1 8 9 6 , ▁the ▁cone - sh aped ▁furn aces ▁were ▁demol ished ▁and ▁replaced ▁by ▁houses . ▁Now ad ays ▁there ▁is ▁hardly ▁any ▁trace ▁of ▁the ▁original ▁bott le works . ▁ ▁Dec line ▁of ▁the ▁coal ▁trade ▁Even ▁with ▁the ▁har bour ▁improvements ▁made ▁by ▁the ▁Del aval ▁family , ▁the ▁har bour ▁was ▁still ▁limited ▁in ▁the ▁size ▁of ▁ships ▁that ▁it ▁could ▁handle . ▁Meanwhile , ▁compet ing ▁ports ▁such ▁as ▁B ly th , ▁to ▁the ▁north , ▁and ▁the ▁Ty ne ▁to ▁the ▁south ▁spent ▁money ▁impro ving ▁the ▁dock ▁facilities . ▁The ▁new ▁North umber land ▁D ock ▁on ▁the ▁Ty ne ▁was ▁completed ▁in ▁ 1 8 5 7 . ▁Se aton ▁S lu ice ▁found ▁it ▁difficult ▁to ▁comp ete ▁with ▁these ▁larger ▁facilities . ▁ ▁A ▁further ▁blow ▁to ▁the ▁coal ▁trade ▁from ▁Se aton ▁S lu ice ▁was ▁the ▁Hart ley ▁pit ▁dis aster ▁that ▁occurred ▁at ▁the ▁village ▁of ▁New ▁Hart ley , ▁about ▁two ▁miles ▁west ▁of ▁Se aton ▁S lu ice . ▁The ▁H ester ▁Pit ▁was ▁the ▁main ▁source ▁of ▁local ▁coal .