PREFACE 



This is the final report of the Hydrographic Office Committee on 

 Instrumentation. Two previous reports (progress reports) are included 

 as Appendixes A and B. This report is composed of sections prepared 

 by several people. Credit has been given for authorship wherever 

 possible. Members of the Committee on Instrumentation assisted in 

 the preparation of Sections II through XVI; Section I was prepared 

 exclusively by the Committee. Various Divisions of the Hydrographic 

 Office were consulted from time to time and asked to contribute 

 information and recommendations. By virtue of this wide participation, 

 it is believed that this report is more representative of Office-wide 

 views than it otherwise would have been. 



An effort was made by the Committee to establish accuracy limits 

 for the various measurements required. However, because of the 

 diversity of applications for each type of data, and the practical 

 willingness of users to trade accuracy for economy, simplicity, and 

 other advantages, this was possible only in a limited way. 



It is the intent of the Hydrographic Office to review annually 

 developments in marine geophysical instrumentation and to summarize 

 significant accomplishments in annual supplements to this report. 



In addition to the present members of the Committee, who partici- 

 pated in the preparation of this report and who are listed below, LCDR 

 R. Plunkett and Mr. R. Fisk were members during the early phases of 

 the Committee's work. Mr. T. J. Wehe coordinated the revision and 

 preparation for printing of the second edition of this report. 



COMMITTEE ON INSTRUMENTATION: 

 B. E. Olson, Chairman 

 G. Jaffe 

 M. H. Schefer 

 A. L. McCahan 

 LCDR J. W. Davies 

 Q. H. Carlson 

 F. B. Woodcock 

 J. J. Chakalis 



