Does 'It is housed in a Martello A series of such towers, some 12 m (40 ft) high and 2.5 m (8 ft) thick, were constructed along the coast at the beginning of the 19th century to guard against invasion by Napoleon.' logically negate the premise 'The largest tower built along the coast was 30 feet high and 6 feet thick.'
It is housed in a Martello A series of such towers, some 12 m (40 ft) high and 2.5 m (8 ft) thick, were constructed along the coast at the beginning of the 19th century to guard against invasion by Napoleon.###The largest tower built along the coast was 30 feet high and 6 feet thick.