Excerpt from International Clinics, Vol. 3: A Quarterly of Clinical Lectures The penetration of the tube will be found to bear a certain rela tion to the length of the spark-gap in air against which the resistance of the tube just balances. Usually the longer this gap, the higher the vacuum of the tube and the more penetrating the radiation there from, but very many tubes will be found in which this rule does not hold even approximately good. 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.