The effects of frost on Iron.
--A Montreal paper relates an incident that occurred a few days since, at the Chatham station of the London, Chatham and Dover railway, which illustrates in a singular manner the astonishing effects of severe frost upon metal. A signal man attempted to lift a large and powerful lever, used for working a signal, when it snapped in two like a pipe stem. The bar was of wrought iron, 2 1/2 inches in thickness, while its weight was only a few pounds less than one hundred weight. The point at which the fracture occurred showed the iron to be of very good quality, and no indication of a flaw could be detected.
