Author: E. Seton Valentine

Publisher: Forgotten Books

Published: 2017-12-24

Total Pages: 344

ISBN-13: 9780484684774

Excerpt from Travels in Space: A History of Aerial Navigation But with all due deference to the brilliant prescience of Roger Bacon, it is still evident from his own writings, although some of his admirers have sought to prove the contrary, that he did not fully understand the principles of atmospheric pressure, or he would not have thought it necessary to get his hollow globe on the surface of the atmosphere. As to his having some knowledge of the consistency of the air as an elastic fluid, that will not be denied, for at that period the attention of the learned began to be directed to the science of pneumatics. But they had no knowledge whatever of the various and distinct gases. 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.