Excerpt from The American X-Ray Journal, Vol. 5: July, 1899 Notice also that the illuminated front area is not right up to the plane of the anticathode but in front of it. More over, if we make the target cup-shaped with its concavity toward the cathode the dark girdle will extend forward, being wider. This appearance is well shown in Fig. 50. As we increase the depth of the concavity in the target the front illuminated area is pushed more forward. Under some conditions we can, on the contrary, make this girdle very narrow by using a flat target, a high vacuum and electro-motive force. 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.