CHAPTER XIII.

THE EXACT MEASUREMENT OF PHENOMENA.

1. The Exact Measurement of Phenomena 270

2. Division of the Subject 274

3. Continuous quantity 274

4. The Fallacious Indications of the Senses 276

5. Complexity of Quantitative Questions 278

6. The Methods of Accurate Measurement 282

7. Conditions of Accurate Measurement 282

8. Measuring Instruments 284

9. The Method of Repetition 288

10. Measurements by Natural Coincidence 292

11. Modes of Indirect Measurement 296

12. Comparative Use of Measuring Instruments 299

13. Systematic Performance of Measurements 300

14. The Pendulum 302

15. Attainable Accuracy of Measurement 303