Excerpt from The Relative Intensities of Metal and Gas Spectra From Electrically Conducting Gases Another aspect of the effect of capacity on the spark should be mentioned here. If a spark with large capacity in parallel and fed with a steady supply of current is examined with a rotating mirror, bright sparks appear at regular intervals. On decreasing the capacity gradually the sparks appear smaller and nearer together, until at a capacity of a few centimeters they are no longer distinguishable. The spark has now become an arc, and from this point of view an arc may be regarded as a rapid succession of very minute sparks. 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.