The contents of the book are as follows 1. Steps Definitions and Theorems Centre of Gravity Curve Tracing, Tangents Parallel Projection Step Proportion Examples 2. Rotations. Turns. Arc Steps Definitions and Theorems of Rotation Definitions of Turn and Arc Steps 3. Quaternions Definitions and Theorem Multiplication The Rotator q()q-1 Powers and Roots Representation of Vectors Addition Formulas Geometric Theorems 4. Equations of First Degree Scalar Equations, Plane and Straight Line Nonions Vector Equations, the Operator φ Linear Homogeneous Strain Finite and Null Strains Solution of φρ = δ Derived Moduli. Latent Roots Latent Lines and Planes The Characteristic Equation Conjugate Nonions Self-conjugate Nonions