Some are a little bit rude. All are to be scanned and recorded to preserve an important element of social history in northwest Wales On thick slate slabs lining a Gwynedd bridge more than a century of community life is recorded in stone. Carved into the slabs are countless names and images that evoke everyday life at what was then one of the world’s busiest slate ports. The crossing at Porth Penrhyn, near Bangor, is known as the “graffiti bridge”. Little known further afield, it’s a treasure trove of etched ships, houses and animals, along with 19th century selfies, locomotives...