Book Description

Excerpt from The London, Edinburgh, and Dublin Philosophical Magazine and Journal of Science, Vol. 41: Fourth Series, January-June, 1871 In the Bessemer process the progress of the decarbonization is determined chiefly by the appearance of the smoke, flame, and sparks which are emitted from the apparatus. Owing to the rapidity with which the reactions take place, it is highly important to catch the exact moment when the blast should be turned off. This is indicated by the colour and brightness of the stream of gas issuing from the converter; and by this the moment of total decarbonization can generally be accurately determined by the naked eye. When, however, pig iron of certain qualities is used (manganiferous iron, for example) this determination is very difficult; even those who have had much experience make frequent mistakes, and find it impossible to produce the same quality of steel at every blow. In order to intensify these flame-indications, use has been made of the spectroscope, and also of various combinations of coloured glasses. The former was first attempted by Dr. Roscoe, and the latter by Mr. Rowan at the Atlas Works. Mr. Rowan experimented with a great variety of coloured glasses, and obtained the best results by using three glasses - two of ultramarine-blue and one of dark yellow. 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.