General Survey of its Principles

Theordur Wulf taught physics at Valkenburg, a Jesuit University from 1904 to 1914 and 1918-1935. He designed and built an electrometer which could detect the presence of energetic charged particles (or electromagnetic waves). Since natural radiation sources on the ground were detected by his electrometer, he predicted that if he moved far enough away from those sources he would detect less radiation.

• Part 1: The Material World 1. Fundamental Ideas Concerning Motion 2. The Motion of Bodies 3. Gravity and Gravitational Fields of Force 4. Elasticity 5. Impact 6. Waves 7. Acoustics Part 2: The Atomic Structure of Matter 1. The Classification of the Elements 2. The Gaseous State of Aggregation 3. The Fluid State 4. The Solid State 5. Temperature 6. Specific Heat 7. Heat and the Various States of Aggregation 8. The Laws of Thermodynamics 9. The Atom Part 3: The Structure of the Atom 1. Magnetism 2. Electrostatics 3. The Electric Current 4. Electromagnetics 5. Electrolysis 6. Ions and Electrons 7. Radioactivity 8. Electromagnetic Waves 9. The Structure of the Atom Part 4: The Physics of the Aether 1. The Undisturbed Propagation of Waves in the Aether 2. The Disturbed Propagation of Life 3. Interference and Diffraction 4. The Polarization of Light 5. Light and Colour 6. The Aether 7. The Aims of Modern Physics