To THE MANY PEOPLE WHO HELPED WlTH THIS BOOK I GIVE MY SINCEHE APPRECIATION. I
would like to thank Jan van der Schans, who instigated this project; Tad Crawford for
easing the obstacles and helping to make this a reality; Kathleen Sheridan for her
unwavering support, great line drawings, and for calmly doing a fine editing job in spite
of frequent changes; Dr. W. Robert Nix, a true craftsman, for contributing his elegant guest
chapter on the bromoil process; Monona Rosso( for her invaluable, detailed advice on
chemical safety; Dr. Michael Ware for generously sharing his ideas and expertise; Klaus
Pollmeier and Suzanne Pastor for making it possible to use a Drtikol image; Dr. Ingeborg
Leyerzapffor her enthusiastic support; Harm Botman for generously allowing me the use
of his densitometer; and, for believing, Larry Evans.