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with Captain E. Sabine FRS, an instrument that accurately measured the dip and intensity of the magnetic field by obser- vation of a magnet turning round a horizontal axis. He and Sabine made important magnetic field observations in Ireland and was a significant contributor to the British Association’s Terrestrial Magnetism program that resulted in the establish- ment of many observatories to study the temporal changes in the Earth’s magnetic field in Britain and later, the world. Dr. Lloyd was responsible for the methods used in these observa- tories and analysis of the global results. During this period of time he contributed to the establishment in 1841 of the School of Engineering at Trinity College, Dublin, see Table 4.
Humphrey Lloyd was considered the most distinguished scholar to hold the position of Provost at Trinity College, Dublin, since N. Marsh (1679). He was honored by Oxford with a Doctorate Honoris Causa (1855), with the Cunningham medal of the Royal Irish Academy (1862), and with the German Cross of the Order “Pour le Mérite” (1874). Lloyd was ahead of his time with his recognition of the importance of university research. The image interference effect and the investigations of Lloyd are indeed an excellent example of the importance of experimental work based on theory for the production of clear unambiguous results. Perhaps this is the real significance of the 19th century Lloyd and explains his acclaim.AT
References
Cantor, G. N. (1983). Optics after Newton, Theories of Light in Britain and Ireland, 1704–1840 (Manchester University Press, Manchester, UK).
Carey, W., Reese, J., and Stuart, C. (1997). “Mid-frequency Measurements of Array Signal and Noise Characteristics,” J. Oceanic Engineering 22(3), 548–565.
Jenkins, Francis, and White, Harvey (1950). Fundamentals of Optics 2nd edition (McGraw-Hill Book Company Inc., New York) pp. 225–239.
Mach, Ernst (1926). The Principles of Physical Optics (Dover Publications, Inc, New York) pp. 164–168.
Tate, J. T. (1945). Physics of Sound in the Sea, edited by L. Spitzer (First published 1945 by National Defense Research Council, Reprinted 1969 by Naval Material Command, LOC 88- 06268, ISBN 0-9321-24-4). Republished by Peninsula Publishing, Los Altos, CA.
Tate, J. T. (1946). Principles and Applications of Underwater Sound, edited by C. Eckart, Dept. of Navy Headquarters of the Naval Material Command, Washington, DC. Available from GPO,1968-{Originally issued as the Summary Technical Report of Division 6, NDRC, Vol. 7, 1946) pp. 24-25, pp. 44–48.
Urick, R. (1967). Principles of Underwater Sound for Engineers, pp 110–114. (also see 3rd edition, Peninsula Publishing, Los Altos, CA, 1983, pp.131–134,).
Young, R. W. (1947). “Image interference in the presence of refrac- tion,” J. Acoust. Soc. Am. 19(1), 1–7.
Humphrey Lloyd References
Lloyd, Humphrey (1831). A Treatise on Light and Vision.
Lloyd, Humphrey (read 1834). “On a New Case of Interference of
the Rays of Light,” Transactions of the Royal Irish Academy
17, 171–177 (1837).
Lloyd, Humphrey (1873). Elementary Treatise on the Wave Theory
of Light, 3rd Ed. (Longmans, Green, and Co., London
(Available Google Books).
Royal Society Obituary (1881). Proc. Royal Society, 1880–1881 (31)
pp. xxi-xxvi, signed JHJ
Lloyd, Humphrey (1877). Miscellaneous Papers Connected With
Physical Science (Longmans, Green, and Co., London (Available Google Books)
Contains:
Lloyd, Humphrey (1833). “On the Phenomena Presented by Light in its Passage Along the Axes of Biaxial Crystals,” Philosophical Magazine 2, 112–120, 207–210 (1833).
Lloyd, Humphrey (1837). “On a New Case of Interference of the Rays of Light,” Read January 27, 1834, Trans. Royal Irish Academy XVII (Royal Irish Academy of Sciences, Dublin).
William (Bill) Carey received his education in engineering and physics at The Catholic University of America. He is an Associate Editor for Signal Processing, the Journal of the Acoustical Society of America. Bill is also an Associate Editor (Formerly Chief Editor) of the Journal of Oceanic Engineering. Currently he is a Professor of Mechanical Engineering at Boston University, an Adjunct Professor of Applied Mathematics at the Rensselaer Polytechnic Institute, and an Adjunct Scientist at the Woods Hole Oceanographic Institution. Previously, he was a Physicist with the Advanced Research Projects Agency assigned to the Massachusetts Institute of Technology Department of Ocean Engineering, where he taught graduate courses in Acoustics. Bill was a Research Physicist and Engineer affiliated with the Navy’s Research and Development Laboratories. At the University of Chicago’s Argonne National Laboratory, he was responsible for acoustic surveillance of power plants. He has been a consultant to both industry and government in the areas of nondestruc- tive testing, nuclear science-environmental measurements, and applied ocean acoustics. Bill Carey, a Fellow of the Society, recently received the Pioneers of Underwater Acoustics Medal. Bill is a Fellow of the Oceanic Engineering Society and has received the IEEE Oceanic Engineering Society's Distinguished Technical Achievement Award, Distinguished Service Award, and an IEEE Millennium Award.
20 Acoustics Today, April 2009