Excerpt from Apparatus and Methods for the Separation, Identification, and Determination of the Chemical Constituents of PetroleumIn constructing the still it was decided to provide the plates In the rectifying column with separate heaters and thermocouples so that the temperatures of these plates could be independently controlled and measured.About the PublisherForgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.comThis 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.