▁a ▁success , ▁and ▁in ▁ 1 7 7 7 , ▁ 1 7 7 ▁ships ▁sa iled ▁out ▁of ▁the ▁har bour ▁carrying ▁ 4 8 , 0 0 0 ▁t onnes ▁of ▁coal . ▁The ▁coal ▁was ▁brought ▁to ▁the ▁har bour ▁from ▁nearby ▁col lier ies ▁via ▁w agon ways , ▁with ▁coal ▁w ag ons ▁being ▁drawn ▁by ▁horses . ▁Salt ▁continued ▁to ▁be ▁export ed ▁from ▁Se aton ▁S lu ice ▁until ▁ 1 7 9 8 , ▁when ▁a ▁new ▁salt ▁tax ▁put ▁an ▁end ▁to ▁the ▁trade . ▁ ▁The ▁bott le works ▁In ▁ 1 7 6 3 ▁Sir ▁Francis ▁Bla ke ▁Del aval ▁( 1 7 2 7 – 1 7 7 1 ) ▁obtained ▁Parliament ary ▁appro val ▁to ▁develop ▁ 1 0 ▁hect ares ▁of ▁land ▁at ▁Se aton ▁S lu ice ▁as ▁glass works . ▁The ▁works ▁was ▁known ▁as ▁' The ▁Royal ▁Hart ley ▁B ott le works '. ▁Sir ▁Francis ▁needed ▁sk illed ▁glass m akers , ▁and ▁his ▁brother ▁Tom ▁Del aval ▁brought ▁sk illed ▁men ▁from ▁Ne in berg , ▁in ▁Germany , ▁to ▁train ▁the ▁local ▁men ▁in ▁glass making . ▁The ▁works ▁used ▁local ▁materials : ▁sea ▁sand , ▁sea ▁k el p , ▁cl ay ▁from ▁the ▁links ▁and ▁local ▁coal . ▁The ▁glass works ▁expanded ▁with ▁time ▁and ▁eventually ▁had ▁six ▁large ▁cone - sh aped ▁furn aces ▁which ▁domin ated ▁the ▁sky line ; ▁they ▁were ▁given ▁the ▁names : ▁Gall agan