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History 181B:  Modern Physics
Class 9 (2/5/01)
Classical world pictures
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Outline Stepping back

     The mechanical philosophy
          Around what does the new field of physics come together?
          Why does mechanics play a privileged role?

     The status of modeling
          Ontological, methodological
          Continental critiques of British muddleheadedness
          Hertz and other philosophers of science

Philosophy:  the goal of scientific theory

     Overall tendencies:  theories as mental devices

     Duhem
          Science is about predicting observations
          Asking for explanations is unscientific

     Mach
          World is sensation, science is about abridged descriptions of them
          Mach's career

World pictures

     Mechanical
          Where does this leave the mechanical world picture?
          Hertz and the foundations of mechanics
               Force is obscure, so replace it with hidden masses
               How do we judge a physical theory?

     Energetic
          British energy physics
          German physical chemistry
          Limitations of energetics

     Electromagnetic
          Make sense of mechanics in terms of EM, instead of vice versa
          Maxwellian EM:  vortices
          Lorentz's reconstruction of Maxwell's theory
               Electrons as connecting the EM aether with matter
               Side effect:  Newtonian mechanics as 1st approximation to EM

Names and terms
Primary Secondary
Ludwig Boltzmann (1844-1906)
antimetaphysics, conventionalism
Pierre Duhem (1861-1916)
"save the phenomena"
Ernst Mach (1838-1916)
economy of thought
Heinrich Hertz (1857-1894)
 Principles of mechanics presented in a new form (1894)
electron, ion
H.A. Lorentz (1853-1928)
Wilhelm Ostwald (1853-1932)
Joseph Larmor (1857-1942)
Copyright © Cathryn Carson 2001