Machinery’s Handbook is indebted to the whole mechanical field for the data contained
in this handbook and hereby expresses its appreciation to all who have assisted in furnish-
ing data, contributed ideas, suggestions, and criticisms concerning the Handbook.
Special thanks are due to current and former members of our staff, including former edi-
tors Riccardo Heald, Muhammed Hussain P.E., and Mr. Robert E. Green for their continu-
ing support and many years of Handbook service, and to Janet Romano, Production
Manager/Art Director for great Handbook cover designs, printing, packaging, and production expertise.
Thanks to Tom Webster of Lineworks Inc., Boise Idaho for an outstanding job of draw-
ing more than 1500 pieces of art for this edition, to Cara Chamberlain for her relentless
copy editing and proofreading of the text, and to Kathy McKenzie, for the same, and for her
invaluable help in rewriting many parts of the Mathematics and Mechanics sections.
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