JOURNAL OF THE SOCIETY OF TELEGRAPH ENGINEERS. INCLUDING ORIGINAL COMMUNICATIONS ON TELEGRAPHY AND ELECTRICAL SCIENCE. PUBLISHED UNDER THE SUPERVISION OF THE EDITING COMMITTEE, AND EDITED BY MAJOR FRANK BOLTON, HON. SECRETARY, AND GEO. E. PREECE, SECRETARY. OTHECAL BIBL London: E. AND F. N. SPON, 48, CHARING CROSS. New York: 446, BROOME STREET. VOL. III.-1874. TABLE OF CONTENTS. Paper "On Underground Telegraphs "-Adjourned Discussion Paper "An Attempt at a Familiar Explanation of the Duplex Prin- Paper "On an Improved Double-Current Telegraph Key," by J. J. Fahie Note "On Mr. Latimer Clark's Method of Measuring Differences of "Indian Telegraph Iron Wire Gauge," by Capt. Mallock "A Method of Duplex Working," by H. C. Mance... "Comptes Rendus," by Dr. Paget Higgs "On the Magnetisation of Steel," by M. Bouty "Calorific Effects of Magnetism in an Electro-Magnet of several Poles," |