This volume encompasses eight chapters from my personal study notes which cover all courses and notes in my study of Nuclear Engineering, from high school throughout my post-doctorate associateship. Great emphasis is added on the two theories of relativity where the author posed many critical questions regarding the optical definition of relative simultaneity which Einstein used to equate matter with energy through the relation E = mc . TABLE OF CONTENTS CHAPTER 1: ELECTRIC DISCHARGE THROUGH GASES 1.1. Electric Discharge under normal gas pressure Ionization Ionization by collision Disruptive discharge Sparking potential and pressure of gas Sparking potential and distance between electrodes Paschen's law Nature of discharge: Brush, spark and corona discharges Mobility of ions Mobility and Nature of the ions Mobility and Ionic Mass Mobility and Gas Pressure Mobility and Temperature Decay of the ions-Recombination 1.2. Electric Discharge under Low Gas Pressure Behavior of emission of radiation in discharge tube Discoveries of the cathode tube Cathode rays Positive rays X-rays Geissler tube Sodium vapor lamp Mercury vapor lamp Fluorescent lamps CHAPTER 2: THE ELECTRON . CHARGE TO MASS RATIO (e/m) Thomson's Method CHARGE OF THE ELECTRON Methods using the Cloud Chamber Wilson Cloud Chamber Thomson's cloud chamber experiment H.A. Wilson's experiment Millikan's oil drop method MASS OF THE ELECTRON RADIUS OF THE ELECTRON CHAPTER 3: THE ELECTRON THEORY ELECTRICAL CONDUCTION IN METALS THERMAL CONDUCTIVITY THERMOELECTRIC EFFECTS Seebeck effect Peltier effect Thomson effect MAGNETIC PROPERTIES OF MATERIALS Methods of measuring magnetic susceptibility Faraday method Curie magnetic balance Gouy method Rowland method Diamagnetism Paramagnetism Ferromagnetisms Variation of magnetization with field Magnetic properties of alloys Heusler alloys Magneto-striction Magneto-thermal effects THEORETICAL INVESTIGATIONS Langevin's theory of diamagnetism Langevin's theory of paramagnetism Weiss molecular field theory of paramagnetism Weiss theory of ferromagnetism ZEEMAN EFFECT CRITICISM OF THE ELECTRON THEORY MAJOR APPLICATIONS OF ELECTRON EMISSION THERMIONIC EMISSION The Schottky effect Cold emission The shot effect 3.8.2. PHOTOELECTRIC EMISSION 3.8.3. PRACTICAL APPLIANCES OF ELECTRON BEAMS 3.8.3. I. THERMIONIC VALVES CHAPTER 4: POSITIVE RAYS POSITIVE RAYS THOMSON'S PARABOLA METHOD OF POSITIVE RAY ANALYSIS ASTON'S MASS SPECTROGRAPH DEMPSTER'S MASS SPECTROGPAPH BAINBRIDGE'S MASS SPECTROGRAPH NIER'S MASS SPECTROGRAPH BAINBRIDGE AND JORDAN DOUBLE-FOCUSING MASS SPECTROGRAPH THE ISOTOPIC CONSTITUTION OF ELEMENTS CHAPTER 5: X-Rays X-Rays PRODUCTION AND DETECTION OF X-RAYS The betatron The ionizing power of X-rays WAVE NATURE OF X-RAYS EXPERIMENT OF LAUE, FRIEDRICH AND KNIPPING EXPERIMENTAL METHODS OF MEASURING FOR X-RAYS CRYSTAL X-RAY SPECTROMETER RULED GRATING X-RAY SPECTROGRAPH ELECTROMAGNETIC THEORY OF X-RAYS THE STRUCTURE OF CRYSTALS CHAPTER 6: RADIOACTIVITY RADIOACTIVITY DISCOVERY OF RADIOACTIVITY INITIAL RESEARCHES ON RADIOACTIVITY FUNDAMENTAL LAWS OF RADIOACTIVITY MEASUREMENT OF THE CONSTANTS OF RADIOACTIVE DISINTEGRATION RADIOACTIVE TIME SCALES ALPHA RAYS BETA-RAYS BECQUEREL'S EXPERIMENT KAUFMANN'S EXPERIMENT BUCHERER'S EXPERIMENT EXPERIMENT OF GUYE AND LAVANCHY GAMMA-RAYS WAVELENGTHS OF THE GAMMA-RAYS USES OF RADIOACTIVITY CHAPTER 7: THE THEORY OF RELATIVITY THE THEORY OF RELATIVITY ORIGIN OF THE THEORY OF RELATIVITY MICHELSON-MORLEY EXPERIMENT TROUTON-NOBLE EXPERIMENT EINSTEIN'S THEORY OF RELATIVITY SPECIAL THEORY OF RELATIVITY IMPORTANT CONCLUSIONS OF THE SPECIAL THEORY OF RELATIVITY GENERAL THEORY OF RELATIVITY CHAPTER 8: THE QUANTUM THEORY OF RADIATION THE QUANTUM THEORY OF RADIATION The classical electromagnetic wave theory QUANTUM THEORY OF RADIATION QUANTA OR PHOTONS The photoelectric effect MILLIKAN'S EXPERIMENT EXPERIMENT OF MAURICE DE BROGLIE The Compton effect CRITICISM OF THE QUANTUM THEORY OF RADIA"