Dinas clay is found at various places in the Vale of Neath in South Wales, in the form of a loose disintegrated sandstone, which is crushed between rollers, mixed with about i% of lime, and moulded into bricks that are fired in kilns at a very high temperature.
Through Landore to Morriston, and also eastwards along the sea margin towards Neath, is the industrial quarter, while the residential part occupies the sea front and the slopes of the Town Hill (580 ft.
The modern development of the port dates from about the middle of the 18th century when coal began to be extensively worked at Llansamlet and copper smelting (begun at Swansea in 1717, though at Neath it dated from 1584) assumed large proportions.
A canal connecting the tidal part of the river Neath with the mouth of the Tawb, made in 1789, was in 1824 connected with the Vale of Neath canal by means of an aqueduct across the Neath river, when also a small dock, Port Tennant (so named after its owner) or Salthouse Dock, was made near the east pier, and this continued to be used till 1880.
In 1832 St John's, St Thomas and parts of the parishes of Llansamlet and Llangyf elach were added to the parliamentary borough of Swansea, to which along with the boroughs of Neath, Aberavon, Kenfig and Loughor a separate representative was given.