ers 
LET. 
IV. 
vi. 
861 
TABLE OF CONTENTS 
Introduction 
1. Purnose 
2. Schematic descripntion of piston gauges 
3. Present theory of piston gauges 
4. Diffraction effects 
5. Irregular reflection 
6. The head-on orientation 
7, Method 
The Preasure Field near a Gauge 
8. Kirchhoff's theorem 
9. Adaptation of Kirchhoff's theorem to problem 
10. Validity of the acoustic avvroximation 
11. The pressure variation at the center of the mouth of an 
orifice 
12. The pressure at other points of the mouth 
The Response of the Pistons 
13. Equation of motion of a piston 
14, Two avproximations 
15. Incompressive approximation 
16. Comparison of the incompressive and central approximations 
17. Estimate of the error in the incomrressive approximation 
18. The interaction between the motions of different vistons 
in the same gauge 
The R B I Ip 
19. The relief pressure from the block 
20. The relief pressure from the water 
21. The criterion for an immovable rigid block 
22. The criterion for an infinitely thick soft block 
23. Comvarison between the preceding criteria 
24, Dimensions of an ideal gauge 
25. Softness and the motion of the front face of the block 
Other Effects 
26. Cavitation 
27. Turbulence 
28. The Bernoulli effect 
Summary 
ee ae 
