been made of stone or wood were now
In 1788 , Thomas Paine, the famous democrat, built in Yorkshire the first iron bridge, which was followed by a great number of others, so that now nearly all bridges, especially for railroad traffic, are built of cast-iron, while in London itself a bridge across the Thames, the Southwark bridge, has been built of this material. Iron pillars, supports for machinery, etc. , are universally used, and since the introduction of gas-lighting and railroads, new outlets for English iron products are opened. Nails and screws gradually came to be made by machinery. Huntsman, a Sheffielder, discovered in 1790 a method for casting steel, by which much labour was saved, and the production of wholly new cheap goods rendered practicable; and through the greater purity of the material placed at its disposal, and the more perfect tools, new machinery and minute division of labour, the metal trade of England now first attained importance.