Excerpt from Evaluation of Forest Fire Retardants: A Test of Chemicals on Laboratory Fires In the wind tunnel, however, rate of spread was so rapid that it had to be measured by thermocouples and oscillographs. Following is a summary of the instrumentation used in both burning areas (see also fig. 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.