This book, "Lehrbuch der Kristallphysik" by Woldemar Voigt, is a comprehensive treatise on crystal physics, excluding crystallography. It was first published in 1910 and republished in 1928 with an additional work by the author and a foreword by Professor M. von Laue. The book covers various aspects of crystal physics, including crystal symmetry, physical functions as directed quantities, thermodynamic principles, and the relationships between scalars, vectors, and tensors. Key topics include: - **Symmetry Properties of Crystals**: Discusses isotropy, crystallographic axes, and the role of crystal form in crystal physics. - **Physical Functions as Directed Quantities**: Explores the systematic classification of directed quantities and their combinations. - **Thermodynamic Principles**: Covers fundamental equations and principles in mechanics, thermodynamics, and electromagnetism. - **Relations Between Scalars and Vectors**: Treats pyroelectricity, piezoelectricity, and their reciprocals, including experimental observations and theoretical developments. - ** Relations Between Vectors and Tensors**: Focuses on elasticity, thermoelasticity, and internal friction, providing detailed mathematical formulations and experimental results. The book is structured into several chapters, each delving into specific areas of crystal physics, with numerous figures and tables to illustrate concepts. It aims to provide a thorough understanding of the field, emphasizing the importance of symmetry and its applications in crystal physics.This book, "Lehrbuch der Kristallphysik" by Woldemar Voigt, is a comprehensive treatise on crystal physics, excluding crystallography. It was first published in 1910 and republished in 1928 with an additional work by the author and a foreword by Professor M. von Laue. The book covers various aspects of crystal physics, including crystal symmetry, physical functions as directed quantities, thermodynamic principles, and the relationships between scalars, vectors, and tensors. Key topics include: - **Symmetry Properties of Crystals**: Discusses isotropy, crystallographic axes, and the role of crystal form in crystal physics. - **Physical Functions as Directed Quantities**: Explores the systematic classification of directed quantities and their combinations. - **Thermodynamic Principles**: Covers fundamental equations and principles in mechanics, thermodynamics, and electromagnetism. - **Relations Between Scalars and Vectors**: Treats pyroelectricity, piezoelectricity, and their reciprocals, including experimental observations and theoretical developments. - ** Relations Between Vectors and Tensors**: Focuses on elasticity, thermoelasticity, and internal friction, providing detailed mathematical formulations and experimental results. The book is structured into several chapters, each delving into specific areas of crystal physics, with numerous figures and tables to illustrate concepts. It aims to provide a thorough understanding of the field, emphasizing the importance of symmetry and its applications in crystal physics.