▁ 1 4 3 0 ▁nave ▁arc ades ▁were ▁re construct ed : ▁two ▁of ▁the ▁original ▁pill ars ▁of ▁Be er ▁stone ▁were ▁left ▁but ▁the ▁other ▁pill ars ▁are ▁of ▁Corn ish ▁gran ite . ▁One ▁b aff ling ▁question ▁concerns ▁the ▁blocked ▁window ▁near ▁the ▁tower ▁which ▁is ▁Early ▁English ▁but ▁does ▁not ▁accord ▁with ▁the ▁rest ▁of ▁the ▁building . ▁ ▁About ▁ 1 4 7 0 ▁the ▁east ▁walls ▁of ▁both ▁tr anse pts ▁were ▁taken ▁down ▁and ▁the ▁a is les ▁extended ▁to ▁the ▁length ▁of ▁the ▁ch an cel , ▁the ▁side ▁walls ▁of ▁the ▁ch an cel ▁being ▁pier ced ▁with ▁arc ades . ▁ ▁The ▁Tower ▁was ▁built ▁in ▁the ▁fif teenth ▁century . ▁There ▁were ▁three ▁alt ars , ▁of ▁which ▁something ▁can ▁be ▁lear nt ▁from ▁the ▁research es ▁of ▁Dr . ▁W . ▁J . ▁Steph ens . ▁The ▁high ▁alt ar ▁was ▁dedicated ▁to ▁St . ▁Col um ba ▁and ▁the ▁B less ed ▁Virgin ▁Mary . ▁The ▁north ▁alt ar ▁was ▁to ▁the ▁Holy ▁Tr inity . ▁The ▁south ▁alt ar ▁was ▁to ▁St . ▁Michael , ▁and ▁stood ▁in ▁front ▁of ▁the ▁screen . ▁The ▁pis cen as ▁of ▁these ▁alt ars ▁were ▁dis closed ▁at ▁the ▁ 1 8 8 6 ▁rest oration ▁and ▁are ▁of ▁be er ▁stone . ▁ ▁Wood work . ▁The ▁screen ▁was ▁destroyed ▁in ▁ 1 7 9 5 . ▁A ▁few ▁fragments ▁may ▁be ▁seen ▁in ▁the ▁North ▁a is le