Machine derived contents note: Preface; 1. Introduction; 2. Machinery; 3. Relative strength; 4. Measurement of length; 5. Direct measurement; 6. Indirect measurement; 7. Systematic measurement; 8. Reduction of dimensions and fundamental units; 9. Error: random and non-random; 10. Interpersonal agreement; 11. Theory and measurement; Bibliography; List of main notation; Index