iv PREFACE 



problems ; to E. W. Woolard of the Nautical Almanac Office of the Naval 

 Observatory for astronomical and related data; and to the many experts 

 consulted at the National Bureau of Standards. Computations for several of 

 the longer tables were made by the Machine Tabulation Unit of the Weather 

 Bureau. Special data or computations for individual tables were furnished 

 by R. Gunn, I. F. Hand, W. E. Howell, L. D. Kaplan, J. B. Leighly, T. H. 

 MacDonald, and R. B. Montgomery, all of which have added greatly to the 

 value of this volume. Permission to reproduce copyrighted material has been 

 kindly granted by the American Air Filter Company, Inc., the McGraw-Hill 

 Book Company, Inc., Prentice-Hall, Inc., and the Reinhold Publishing Cor- 

 poration ; all such material is acknowledged at its point of insertion in the text. 

 Thanks are also due Mrs. G. B. Morgan for her invaluable assistance in per- 

 forming many of the computations and in typing the manuscript. 



Robert J. List 

 Washington, D. C. 

 September 30, 1949. 



NOTE TO FIRST REPRINT 



Opportunity has been taken in this reprint to correct the few errors that have been 

 discovered in these tables since the original printing. 



Editor. 

 February 1958 



NOTE TO SECOND REPRINT 



This reprint corrects three or four errors discovered in these tables since the first 

 reprinting. 



Editor. 



March 1963 



NOTE TO THIRD REPRINT 



This reprint is without change in the text, since no errors have been brought to our 

 attention since the second reprinting. 



Editor. 

 April 1966 



