Heinrich Franz Bernhard Müller (May 13, 1851 in Breslau – April 24, 1925 in

Grunewald Grunewald is the name of both a locality and a forest in Germany: * Grunewald (forest) * Grunewald (locality) Grünewald may refer to: * Grünewald (surname) * Grünewald, Germany, a municipality in Brandenburg, Germany * Grünewald (Luxembourg), ...

, Berlin, known as Müller-Breslau from around 1875 to distinguish him from other people with similar names) was a German

civil engineer A civil engineer is a person who practices civil engineering – the application of planning, designing, constructing, maintaining, and operating infrastructure while protecting the public and environmental health, as well as improving existing i ...

and high school teacher. He provided significant contributions to the theory of beams and frames in

structural analysis Structural analysis is a branch of solid mechanics which uses simplified models for solids like bars, beams and shells for engineering decision making. Its main objective is to determine the effect of loads on physical structures and their c ...

. Müller-Breslau was both a practicing engineer and theoretical researcher during his lifetime. He brought the previously separate elements of classical structural analysis together in a unified theory of beams and frames. He systematized the computational methods, in particular the principle of

virtual displacement In analytical mechanics, a branch of applied mathematics and physics, a virtual displacement (or infinitesimal variation) \delta \gamma shows how the mechanical system's trajectory can ''hypothetically'' (hence the term ''virtual'') deviate very ...

s, and applied the energy sets systematically. He also calculated structures of

airship An airship, dirigible balloon or dirigible is a type of aerostat (lighter-than-air) aircraft that can navigate through the air flying powered aircraft, under its own power. Aerostats use buoyancy from a lifting gas that is less dense than the ...

s. After finishing school in 1869, he fought in the

Franco-Prussian War The Franco-Prussian War or Franco-German War, often referred to in France as the War of 1870, was a conflict between the Second French Empire and the North German Confederation led by the Kingdom of Prussia. Lasting from 19 July 1870 to 28 Janua ...

, after which he began to study at the Berlin Trade Academy in 1871. He also attended lectures in mathematics taught by

Elwin Bruno Christoffel Elwin Bruno Christoffel (; 10 November 1829 – 15 March 1900) was a German mathematician and physicist. He introduced fundamental concepts of differential geometry, opening the way for the development of tensor calculus, which would later provid ...

and

Karl Weierstrass Karl Theodor Wilhelm Weierstrass (; ; 31 October 1815 – 19 February 1897) was a German mathematician often cited as the " father of modern analysis". Despite leaving university without a degree, he studied mathematics and trained as a school t ...

Berlin University The Humboldt University of Berlin (, abbreviated HU Berlin) is a public research university in the central borough of Mitte in Berlin, Germany. The university was established by Frederick William III on the initiative of Wilhelm von Humboldt ...

. As a student he helped fellow students of the School of Architecture with their revision of structural analysis and prepared them for the second state examination. Based on this teaching he compiled his first textbook ''Elementares Handbuch der Festigkeitslehre'' (Elementary handbook of the strength of materials) in 1875. Two years later he wrote contributions on elasticity and

strength Strength may refer to: Personal trait *Physical strength, as in people or animals *Character strengths like those listed in the Values in Action Inventory *The exercise of willpower Physics * Mechanical strength, the ability to withstand ...

as well as structural mechanics for ''Hütte - Des Ingenieurs Tachenbuch'' (Hütte's engineer's handbook).

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* German civil engineers Engineers from the Kingdom of Prussia 1851 births 1925 deaths German schoolteachers Academic staff of Technische Universität Berlin {{Edu-bio-stub

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