columns, snh(u,k), cnh(u,k), dnh(u,k), added to ours, would open up the 

 complex argument territory. In the popular field of undergraduate mathe- 

 matics, a new elementary text on elliptic functions with a wide variety of 

 problems and applications, supplemented by an adequate set of 5-place tables, 

 would be a boon to teachers and students. 



It is a pleasant task to acknowledge our indebtedness to Messrs. John Hook, 

 Arthur Gels, Earl Boland, John Brinko, Edward Murphy, and Victor Sutcliffe, 

 who, as N. Y. A. students, shared the work with us in the earlier years. These 

 young men became expert and dependable computers; our thanks to them 

 and to the Federal Government which paid them for their splendid and 

 efficient work. 



The considerable cost of printing these tables has been defrayed mainly by a 

 grant from the Research Corporation of New York. Grateful acknowledge- 

 ment is made for that grant, without which this volume could not have 

 appeared. 



We wish to acknowledge here our deep indebtedness to Dr. C. G. Abbot, 

 former Secretary of the Smithsonian, for his invaluable advice and encourage- 

 ment throughout. Dr. A. Wetmore, who has succeeded Dr. Abbot as Secre- 

 tary, has assumed full responsibility for the publication of this volume, and 

 for the work of seeing it through the press. We can never repay these two 

 great men, and their corps of advisers, for their critical advice and practical 

 assistance. To have been associated with them, however humbly, has been for 

 us the experience of a lifetime. 



G. W. S. 



Oxford, Ohio, R. M. S. 



April 25, 1946. 



