INDEX 



91 



N 



Page 



Names of parts, portable gage 19 



Standard gage 6 



O 



Observer's duties 41 



Operating diflSculties 49 



Operation of tide station 41 



Paper 15, 24, 42, 49, 58 



Parts, names of, portable gage 19 



Standard gage 6 



Pencil 16, 42 



Pencil arm 16 



Pencil screw 15 



Cleaning 45, 49 



Pipe gage 4 



Plane of flotation, tape gage 30 



Planes of reference : — 76 



Portable automatic tide gage. {See 



Automatic tide gage, portable.) 



Portable tide staff 2 



Precautions against freezing, float 



well 28 



Pressure gage 5 



Primary bench mark 40 



Primary tide station 1, 25 



Purposes of tide observations 1 



R 

 Range of tide 73 



Reading tide staff 44 



Receiving roller, standard gage 15 



Record cylinder, portable gage_ 20, 58 



Record paper, portable gage 24, 58 



Standard gage 15,42,49 



Recording stylus, portable gage- 20,58 



Reducers for soundings 78 



Reductions. (See Tabulation and 

 reduction. ) 



Report on inspection 50 



Requisition for supplies 47 



Rollers, standard gage 15 



Salinity 85 



Scale, vitrified 2 



Scale of gage, portable 23 



Standard 18 



Secondary tide station 1, 52 



Shipment of Government property. 47 



Sign for tide house 28 



Simultaneous observations, com- 

 parison 72, 75 



Soundings, location of gage 53 



Abnormal tides due to config- 

 uration of shore 53 



Effect of wind 54 



Exposed channel approaches 53 



Outer coast 53 



Upper reaches of tidal rivers- 53 



Spring range of tide 77 



Staff reading 44 



Page 

 Standard automatic tide gage. 



(See Automatic tide gage, 



standard.) 



Standard disk bench mark 37 



Standard time 43, 60, 64 



Stylus, portable gage 20, 58 



Stylus arm 20 



Stylus screw 20, 59 



Supplies for primary tide station 47 



T 



Tables : 



Allowable error in leveling 41 



Arrangement for hourly height 



tabulation - 68 



Conversion of centigrade to 



Fahrenheit scale 83 



Density and salinity 88 



Differences for reducing den- 

 sity of sea water to 15° C 86 



Factor F{Mn) for reducing 



range of tide 75 



Factor Fi for correcting DHQ 



and DLQ 75 



Factors for correcting plane of 



flotation 32 



Pulley installation 34 



Reduction of Greenwich inter- 

 vals to local intervals 73 



Scale combinations, standard 



gage 18 



Scale ratios, iwrtable gage 23 



Time required for tide wave 



to travel 80 



Tabulation and reduction 59 



Checking height datum 61 



Checking time 60 



Comparative readings 61 



Comparison of simultaneous 



observations 72, 75 



Correction for longitude of 



moon's node 74 



Density reduction 84 



Diurnal high and lov water 



inequalities 74 



Factors for reduction 74 



Field reductions 59 



' Height reductions 61,66,73 



High and low water tabu- 

 lation 63 



Hourly height tabulation 66 



Interpolations 68 



Lunitidal intervals 69 



Preliminary work 59 



Salinity 85 



Tidal datums 76 



Time to be used 60,64 



Tape gage 3 



Inspection 51 



Installation ,29 



Plane of flotation 30 



Temperature and density observa- 

 tions 81 



Tension cord 17 



Tension weight 17, 37 



