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to use their material in this book. Because the list of the contributors is
long, I trust I will be forgiven to mention only a few names:
My thanks go to the late Frank Hazel of Worcester Controls for his con-
tribution to the field of manual valves; in the field of pressure relief valves
to Jurgen Stolte and the late Alfred Kreuz of Sempell A.G.; Manfred
Holfelder of Bopp & Reuther G.m.b.H.; and Mr. Gary B. Emerson of
Anderson, Greenwood & Co. In the field of rupture discs, my thanks to
Tom A. LaPointe, formerly of Continental Disc Corporation, and G. W.
Brodie, formerly a consultant to Marston Palmer Limited.

R. W. Zappe

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