By popular request, the National Bureau of Standards was again a host to a conference on cryogenic engineering on August 19-21, 1957. Similar meetings were held here in 1954 and 1956. The acceptance of over forty papers for this conference was certainly a sign of the increasing activity and interest in this engineering field. There seems little doubt that it will continue to grow, justifying the need for annual meetings. To make the Proceedings more interesting an attempt was made to include as much as possible of the general discussion which followed each paper. To obtain individual reprints of anyone particular paper, please contact the authors directly. 1957 CRYOGENIC ENGINEERING CONFERENCE COMMITTEE B. W. Birmingham National Bureau of Standards S. C. Collins Massachusetts Institute of Technology E. F. Hammel Los Alamos Scientific Laboratory R. B. Scott National Bureau of Standards K. D. Timmerhaus University of Colorado W. T. Ziegler Georgia Institute of Technology i ACKNOWLEDGMENTS The 1957 Cryogenic Engineering Conference Committee gratefully acknowledges the continued support and interest of the following organizations who have made the 1957 Cryogenic Engineering Conference and the publication of this Proceedings possible. L'' Air Liquide Air Products, Inc. Allison Division, General Motor s American Messer Corporation Aro Equipment Corporation Beech Aircraft Corporation Bell Aircraft Boeing Airplane Company Cambridge Corporation Convair Curtiss-Wright Corporation Garrett Corporation General Electric Company Herrick L. Johnston, Inc. Hofman Laboratories Linde Company A. D. Little, Inc.