The following experiments were made with a view to ascertain the merits, in point of strength, of some of the different British pig irons which are brought into our market. Almost every manufacturer, or his agent, tells us that his own pig iron is the best and strongest which is made; and therefore, excepting an iron founder be mindful to test the iron which he buys, he is not only liable to be imposed upon, but to produce from his foundry such an article as may, from time to time, incur to himself serious pecuniary losses, and injure his reputation as a respectable tradesman and iron founder. They were also undertaken with a view to ascertain what mixtures of the different pig irons would give the strongest and soundest grain.
All the experiments here noted were made upon bars cast from the same model; taken from the sand without any dressing, such as chipping or filing; tested with the same apparatus, and uniformly with the same care. The dates of the experiments are also recorded.
1. In August, 1840, a bar of cast iron of the dimensions already stated, viz., 12 inches long by 1 inch square, made from the Bierley Company’s regular No. 3 pig, sustained ere it broke, 24 cwt. Another bar was taken which was cast at the same time, and from the same metal, which broke with 25 cwt.
Note.—These two bars were cast in green sand.
With the same metal, and at the same ...
- © Yorkshire Geological Society, 1839-42