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Excerpt from The Messenger of Mathematics, Vol. 9: May, 1879-April, 1880 Hence every cylinder of which the nodal line is one generating line cuts the cylindroid in an ellipse; for it must also touch one generating line of the cylindroid. 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.