CONTENTS 



Page 



Foreword ii 



Purposes of tide observations ^ 1 



Tide gages 1 



Tide staff 2 



Tape gage 3 



Pipe gage 4 



Pressure gage 5 



Fathometer 5 



Standard automatic tide gage 5 



Portable autom.atic tide gage 18 



Primary tide station 25 



Location 25 



Float well 1 26 



Tide house 28 



Installation of tide staff - 29 



Installation of tape gage - 29 



Installation of standard autoro.atic tide gage 32 



Tidal bench marks 37 



Operation of tide station 41 



Inspection of tide station 50 



Secondary tide station 52 



Location 53 



Establishm.ent of secondary tide station ^ 54 



Installation and operation of portable automatic tide gage -. 55 



Field reductions 59 



Tabulation and reduction 59 



Prelipiinary work 59 



High and low water tabulation 63 



Hourly height tabulation 66 



Interpolations 68 



Lunitidal intervals 69 



Height reductions 73 



Tidal datums ^ 76 



Tide reducers for soundings 78 



Ternperature and density observations 81 



Temperature 81 



Density 83 



Index 89 



ILLUSTRATIONS 



1. Portable tide staff and support 2 



2. Tape gage 3 



3. Standard automatic tide gage (with cover) . 7 



4. Standard automatic tide gage (f ron^ view) 8 



5. Standard automatic tide gage (side and back) 9 



6. Standard automatic tide gage (clock connection) 10 



7. Standard automatic tide gage (recording pencils) 11 



8. Standard automatic tide gage (right forward end) 12 



9. Standard automatic tide gage (left forward end) 13 



10. Standard automatic tide gage (paper installation) 14 



11. Portable automatic tide gage (front) 19 



12. Portable automatic tide gage (left side) ^ 21 



13. Portable automatic tide gage (detail of stylus and float drum) 22 



14. Float well 26 



III 



