ts 
EXPERIMENTS ON THE PRESSURE WAVE THROWN 
OUT BY SUBMARINE EXPLOSIONS. 
CONTENTS. 
PART I.—-RESULTS. 
SECTION. 
1. Origin and purpose of the experiments - - - - = 
2. Scope of the results - = + = = 2s 2 
3. Nature and genesis of the pressure wave - 
4. Effect of a 300-lb. charge of 40/60 Amatol at a distance of 50 feot - 
5. Regularity and symmetry of the pressure wave - - 
6. Velocity of the pressure wave - - - - - - 
7. Variation of pressure with distance - - - = = 
8. Surface effects - - - - - - 
9. Comparison of large aad small charges - - - - - - 
10. Bottom effects - - = = 
11. Effect of surrounding ihe ieee with an air Shaalien - - - 
12. Comparisons of different explosives - - - - - 
13. Gunpowder charges - - - - - = = 
14. Composite charges - - - . - - - 
15. Influence of the shape of the charge = - - - - - 
16. Damaging power of different pressure waves” - - - - 
PART I{.—METHODS. 
17. Gauges for measuring the time-integral of the pressure = - 
18. Gauges for determining the complete time-pressure curve - - 
19. Gauges for measuring the maximum pressure - = 
20. Gauges for empirical comparisons of pressure (plasticine nee) - 
21. Methods of laying out the charge and gauges in the water - - 
22. Alternative methods for determining the time-pressure curve: Hopkin- 
son’s pressure-bar method: Sir J. J. Thomson’s piezo-electric 
method - - - - - - - 
23. Measurements of the velocity of ie pressure wave : - - 
24. Measurements of the echo reflected from the bottom - - = 
APPENDIX I.—SCHEDULE OF CHARGES AND SHOTS. 
25. List of charges - - - - - - = - 
26. List of shots - - - - - - - - 
APPENDIX I1.—CALIBRATION EXPERIMENTS. 
27. Apparatus . - - - - - - - 
28. Results - - - - - - - - - 
APPENDIX IIL—MISCELLANEOUS. 
29. Some general points in the theory and use of pressure gauges - - 
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