Johann Georg Kohl (1808-1878) about the importance of Welsh slate industry:
Towards evening, we arrived in Caernarvon, the shire’s capital of the same name and one of the largest towns in Wales. Caernarvon is, like most towns of this country, inhabited by the local Welsh and by English immigrants. It is directly situated on the Menai Strait and because it is surrounded by slate quarries, just like Bangor and other towns in north Wales, its main income is derived from the production of this seemingly insignificant article which, however, has become important owing to a particular phrase (which can be heard in every English factory town and all towns of trade if one inquires about the destinations of their goods): “All over the world!” (Kohl 203)
Kohl, Johann Georg. Reisen in England und Wales. Dresden: Arnold, 1844. Print.
(Source: archive.org, via wisgi)