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<abstract>Richard Threlfall founded the School of Physics at the University of Sydney, having been appointed Professor of Physics in 1886. The building and equipping of a laboratory was completed in 1888. He continued his research in parallel with teaching, focussing on explosives and explosions, the electrical properties of dielectric materials, and the invention quartz thread torsion balance which enabled highly accuracy measurement of gravity in different locations. Threlfall was active in scientific organisations, holding officer as President of the Royal Society of New South Wales and of Section A of Australasian Association for the Advancement of Science. Having resigned his position in 1899 Threlfall returned to the United Kingdom, becoming scientific advisor to Albright &amp; Wilson Co., Birmingham, England until 1932. During WWI his research related to smokescreens, munitions and chemical warfare.</abstract>
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