INDEX. 



299 



Waves, period of, 26, 33 



, power of, may be over-estimated, 



75-80 



, , at Alderney, 84 



, , at Bishop Eock, 85 



, , at Bouud Skerry, 82 



. , at Dim Heartach light- 

 house, 84 



, , at Fastnet Rock, 85 



, , at Holburn Head, Caithness, 



80-82 



, , at Manora breakwater (Kur- 



rachee), 84 



, , at Scilly Isles, 86 



, , at Wick, 84 



1 1 at Wolf Kock, 86 



, , at Ymuiden (Holland), 83 



, , on coast near Wick, 78, 79 



reduced in height by crossing 



shoals, 32 



, reduction of, in harbours, 161, 162 



, theory of, 23 



, velocity of, 32, 33 



, wheeling of, 74, 75 



Wave-screens, 225-231 



Weather charts, 6, 14 



Weber, experiments on waves, 23 



Weed-fields act as floating breakwaters, 



231 

 Weight of blocks used in breakwaters, 



194, 196, 213-215 



of breakwater superstructures 



causes settlement, 275 



of setting machines causes settle- 

 ment, 181, 276 



Wick breakwater, failure of, 178 

 Width of harbour entrances, 159-161 



Willet on proportions of ingredients for 



concrete, 121, 122 

 Wind, 1-22 



diagrams, 2, 3 



, direction of, influenced by trend 



of coast, 4 



, effect of, on currents, 67, 68 



, , on tides, 56, 57 



, force of, varies with barometric 



gradient, 14, 15 



gauges, 7, 9 



, harbour entrances affected by, 20 



, indications of, 19 



, influence of, on littoral drift, 1, 20 



, "jumping" of, 16 



, relation of velocity to pressure, 



7-12 



, temporary currents caused by, 68 



, the generator of sea-waves, 1 



, theory of, 4 



Worm. See Teredo, Limnoria, Chelura 

 Wrought iron, corrosion of, in sea-water, 



139-144 



Ymuiden harbour, current past entrance, 

 70, 160 



, dredging at, amount of and 



cost, 285 



, power of waves at, 83 



, stability of blocks in wave- 

 breakers, 215 



, width of entrance, 160 



Young, Archibald, on harbour accommo- 

 dation for fishing-boats, 169, 170 



PRINTED BY WILLIAM CLOWES AND SONS. LIMITED, LONDON AND BECCLES. 



