72 INDEX 



Page 



Distance traveled during a tidal cycle 7, 8 



Duration of slack 8 



Easthampton (U. S. S.), temporary lightship 26, 30, 32, 47 



Ebb 1 



Explanation of current data 20-24 



Falcon (U. S. S.), temporary lightship 26, 34, 51 



Fenwick Island Shoal Lightship 26, 30, 34, 41, 52 



Finch (U. S. S.), temporary lightship 26, 33, 50 



Fire Island Lightship 26, 29, 33, 37, 45, 50, 59, 68-70 



Five Fathom Bank Lightship 26, 30, 34, 51 



Flood . 1 



Frying Pan Shoals Lightship 13, 14, 26, 31, 35, 38, 46, 53, 65, 68-70 



Georges Bank and vicinity, current charts 25, 26 



Graphic current data. See List of illustrations, pages iii and iv. 



Graphic current data, explanation of 24 



Great Round Shoal Lightship 26, 30, 32, 40, 48 



Greenwich intervals, current 21 



tide 36 



Greenwich luner transits, used as time reference for currents 18, 21, 26-35 



used as time reference for tides 21, 22, 36 



Gulf Stream at Diamond Shoal Lightship 24 



Handkerchief Lightship 26, 27, 32, 43, 49 



Harmonic analysis 14, 19 



Harmonic constants 14, 19, 22, 36-44 



Hedge Fence Lightship 26, 27, 33, 49 



Hen and Chickens Lightship 26, 30, 33, 37, 45, 49, 57, 68-70 



Intervals, Greenwich, current 21 



tide 36 



Knot 2, 17 



Long Island (U. S. S.), temporary lightship 26, 31, 35, 53 



Martins Industry Lightship 26, 31, 35, 42, 53 



Maximum current 10 



Mean current hour 21 



Mean values 15 



Minim.um current 10 



Mixed current 4 



Nantucket Shoals Lightship 9-13, 22, 23, 26, 30, 32, 36, 45, 48, 67, 68-70 



Nontidal current 1,3, 12-14, 17, 23,26,47-54 



effects of 3, 12-14 



reduction 18, 19 



seasonal variation in 23, 26, 47-54 



Northeast End Lightship '. 26, 30, 34, 37, 45, 51, 61, 68-70 



Observations, current, method of obtaining 16 



method of reducing 17-20 



Overfalls Lightship 23,26,28,34,44,51, 62, 68-70 



Periodic variations in tidal currents 3, 4, 12 



Pole, current 16 



Pollock Rip Lightship 26,27,30,32,40,43,47,48 



Pohock Rip Slue Lightship 21, 26, 27, 30, 32, 36, 45, 47, 56, 68-70 



Portland Lightship 26,29,32,40,47 



Progression of tide and velocity of tidal current 8,9 



Progressive wave 5 



Ram Island Reef Lightship 26,27,33,44,49 



Resolution of currents 18 



Reversing current velocity curves 2-6, 18 



Reversing tidal currents 1-9 



Rotary current diagrams 10, 11, 13 



Rotary tidal currents 9-14, 26, 30-35 



St. Johns Lightship 22, 26, 29, 35, 40, 46, 54, 67-70 



Savannah Lightship 26, 31, 35, 39, 46, 53, 66, 68-70 



Scotland Lightship 26, 30, 33, 41, 51, 60, 68-70 



Seasonal variation in nontidal current 23, 26, 47-54 



Semidaily current 4 



Shovelful Shoal Lightship 26, 27, 32, 48 



Slack water 1 



duration of 8 



