Excerpt from Mutual Inductance of Coaxial Solenoids Various formulae for the calculation of the mutual inductance of coaxial solenoids have been given from time to time. Although few of these formulae are exact, several of the approximate formulae per mit inductances to be calculated with very great accuracy by using a sufficient number of terms of the series by which they are expressed. We have collected a number of these formulae and propose in this paper to compare and test them, and to give their derivations in some cases where the proofs that have been given are incomplete or wanting altogether. 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.