Penrhyn slate quarry History Points
Having begun operation in the 18th century, Penrhyn became the world''s largest slate quarry in the 19th, when it employed more than 2,500 people. Bethesda town grew rapidly, and in 1864 there were complaints that the population of 8,000 had just two resident policemen to maintain order! Visitors, including Princess Victoria, came to gaze at ...