b'ASEG Special Publication50TH ANNIVERSARY SPECIAL PUBLICATIONMEASURING TERRESTRIAL MAGNETISMthe evolution of the AIRBORNE MAGNETOMETER and the rst anti-submarine and aeromagnetic survey operationsPeople, Planes, Places and Events 1100s1949W.D. (Doug) MorrisonThis Special Publication is co-sponsored byCanada and the United States charged their national mining GeoscienceAustralia and ASEG and geological survey departments with investigating and establishing programs of major aerial magnetic surveying https://www.aseg.org.au/publications/book-shop and mapping in the search for minerals and energy.This book, covering a global expanse of more thanThe story explores the inextricable cross-discipline 800years, recounts the largely untold story of measuringconnections of terrestrial magnetism and magnetometers terrestrial magnetism and of the extraordinary people,as used for navigation, geodesy, anti-submarine and military planes, places and events that have contributed to thepurposes, and their role in the geophysical oil and mineral evolution of the magnetometer and the \x1erst anti-submarineexploration industry. Organisations, people and speci\x1ec and aeromagnetic geophysical survey operations. It is ainstruments and aircraft are noted, including (at times unique journey of science and engineering, of inventions,coincidental) Australian connections.new methods and instruments a compelling story of howThe extraordinary depth and scope of research, over the measurement of terrestrial magnetism has in\x1cuencedmany decades, by the author W.D. (Doug) Morrison, as the history of the world. well as his collection of photos and illustrations, and his This is an operational historical record rather than a historyastonishing attention to detail, make this book an amazing of the theory of terrestrial magnetism. The story beginsand immersive historical reading experience and a future at the earliest documented geomagnetic discoveries andprimary reference work. Through several decades Doug has moves on to observations of magnetic intensity and thedeveloped an extensive reference network of geophysical \x1erst ground magnetic surveys. We see how the instrumentssurvey practitioners, and former experts in military, aviation used for geomagnetic observations from moving airborneand maritime matters. Through their little-known stories platforms evolved in parallel with the evolution of \x1cightand personal re\x1cections, and his access to personal and from balloons (from 1784) to airships and eventually aircraft. o\x1bcial archive material from this network, Dougs narrative brings unique insights into the evolution of the airborne In the 1930s and 1940s there were major advances inmagnetometer. Along that timeline he has produced details magnetometry, in USSR, Japan and Germany as wellthat are not available in public historical material.as in USA and UK. In USA and UK these advances were applied in military surveillance systems, including in theMeasuring Terrestrial Magnetism is a major work of 630 detection of submarines. Landmark World War II inductionpages, illustrated throughout with 156 plates of gures coil and \x1cuxgate instrumentsthe \x1erst of the modernand photos, and including comprehensive Endnotes, technologies enabled aeromagnetic acquisition, mappingAppendices, References and Index.and direct detections of ore bodies from the air from mid-1944 onwards, foreshadowing todays airborne magnetic 2020 Australian Society of Exploration Geophysicists (ASEG) surveys. The military developments of magnetometers wereand Commonwealth of Australia (Geoscience Australia)taken up, rapidly advanced and applied by the mineral exploration industry to \x1end new economic deposits ofISBN978-0-6450691-0-5 (paperback)magnetic mineral ores. Countries including Australia,https://www.aseg.org.au/publications/book-shop38 PREVIEWAPRIL 2024'