Excerpt from On the Use of Hot Air in the Iron Works of England and Scotland: Translated From a Report, Made to the Director General of Mines in France, by M. Dufrenoy, in 1834 In order that the advantages which result from hot air may be duly appreciated, I will give a statistical review of the principal establishments which I visited I will describe those apparatus which present varieties; and compare the con sumption and expense incurred in the manufac ture of a ton of pig iron before the introduction of hot air, with what it requires in the same works under the new system. This description may appear tedious, but on a question of so much importance to those engaged in the manufacture of iron, nothing ought to be omitted which may tend to elucidate the subject. I will afterwards enter into some detail upon the different sorts of coal used in these works, and also upon the ex pense of manufacturing pig iron in Wales; and will conclude this report with a summary of the principal experiments made for the introduction of the hot air process into the French iron works. Previous to entering upon this description, I ought to acknowledge the gratitude I feel to wards the proprietors of the works I have visited, almost all of whom have afforded me the means of examining their establishments minutely, proving thereby that the only rivalry existing between France and England, is in the desire of improvement. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.