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Excerpt from The Progress of Marine Engineering, From the Time of Watt Until the Present Day The closed furnace hot-blast system while equally effective is much more economical on account of utiliz ing the heat and reducing the temperature of the waste furnace gases, in order to heat the blast which supports combustion. The furnace is under complete control, and there is no injury resulting from cold air entering the furnace. Methods of feeding and shaking grates are coming into use, so that there may be a continuous coking and heating of the coal, preventing smoke, and. That the grates may be kept free from clinkers and ashes. 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.

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