structure evolved from a prehistoric form containing the essential core and crucible.' The transition from the mid-fifteenth century European blast furnace to the early nineteenth century charcoal furnace of Pennsylvania was gradual. Technological changes occurred chiefly in the shape and size of the

produced 1,066 tons of merchant bar and rod." Between 1856 and 1860, the Columbia Rolling Mill was idle, and the newly-formed Committee on Trade sought to find a buyer for the property as its first project." Their efforts bore fruit when Colonel William C. Case of Danville, Pennsylvania, and Caleb S

. York, like Lancaster, has a glorious heritage. It has played important roles in the history of our commonwealth and nation. Let all communities, large and small, ancient and new, take pride in their legitimate accomplishments without fabricating spurious monuments. John W. W. Loose is a retired high