(1) The Range of Electric Searchlight Projectors (2) The Calculation and Measurement of Inductance and Capacity (3) Electric and Magnetic Measurements (4) A Laboratory Course of Practical Electricity for Vocational Schools and Shop Classes (5) Electrical Measurements and Testing: Direct-and Alternating-Current (6) Electrical Laboratory Course for Junior Students

Abstract

(1) SINCE the outbreak of the war there has been an urgent demand by our airs naval, and military forces for information relating to the range of searchlight projectors. We therefore welcome this translation of M. Jean Reys work. It is an open secret that during the course of the war very great improvements have been made in the manufacture of the carbons for projector lamps, and that they give a flux of light for a given power consumption from three to five times as great as that obtained from the old carbons. (1) The Range of Electric Searchlight Projectors. By Jean Rey. Translated by J. H. Johnson. Pp. xiv + 152. (London: Constable and Co., Ltd., 1917.) Price 12s. 6d. net. (2) The Calculation and Measurement of Inductance and Capacity. By W. H. Nottage. Pp. 137. (London: The Wireless Press, Ltd.) Price 2s. 6d. (3) Electric and Magnetic Measurements. By Charles Marquis Smith. Pp. xii + 373. (New York: The Macmillan Co.; London: Macmillan and Co., Ltd., 1917.) Price 10s. 6d. net. (4) A Laboratory Course of Practical Electricity for Vocational Schools and Shop Classes. By M. J. Archbold. Pp. ix + 211 + exp. 98. (New York: The Macmillan Co.; London: Macmillan and Co., Ltd., 1916.) Price 5s. net. (5) Electrical Measurements and Testing: Direct-and Alternating-Current. By Chester L. Dawes. Unpaged. (New York: John Wiley and Sons, Inc.) Price 3s. net. (6) Electrical Laboratory Course for Junior Students. By Prof. Magnus Maclean. Pp. 120. (London: Blackie and Son, Ltd., 1916.) Price 2s. net.