High water mark

“ and yet the high-water mark, so to speak, of Socialist literature is W. H. Auden, a sort of gutless Kipling,1 and the even feebler poets who are associated with him. ”

“ I believe that any man's life will be filled with constant, unexpected encouragements of this kind if he makes up his mind to do his level best each day of his life—that is, tries to make each day reach as nearly as possible the high-water mark of pure, unselfish, useful living. ”

“ Some have great broad stone staircases leading down to the water, with heavy stone balustrades ornamented with statuary and fancifully adorned with creeping vines and bright-colored flowers—for all the world like a drop-curtain in a theatre, and lacking nothing but long-waisted, high-heeled women and plumed gallants in silken tights coming down to go serenading in the splendid gondola in waiting. ”

“ At length the waves at full wash within a few yards of the granitic block. And now, yielding to the undermining influences, just as a blinding snow-shower is darkening the heavens, it comes thundering down the steep into the sea, where it lies immediately beneath the high-water line, surrounded by a wide float of pulverized ice, broken by the waves. A keen frost sets in; the half-fluid mass around is bound up for many acres into a solid raft, that clasps fast in its rigid embrace the rocky fragment; a stream-tide, heightened by a strong gale from the west, rises high on the beach ”

“ The front side of this great wave takes an almost vertical position, resembling an advancing wall of water, and works great havoc with boats and shipping which have had the misfortune to be left in its path. To understand more completely how a “bore” is formed, the reader must be reminded of the cause of all tidal phenomena. Any one who lives by the sea or an estuary knows well that the sea-level rises and falls twice every 24 hours, and that the average interval of time between high water and high water is nearly 121⁄2 hours. ”

“ The unit used for elevations is also stated on the face of the chart, as also the plane to which elevations are referred. On the United States charts this is generally mean high water and on British charts the high water of ordinary spring tides. Rocks and islets usually have figures shown beside them, either in brackets or underscored, which indicate the height above high water. Rocks which are bare at low water sometimes have a note "dries" or "bares" so many feet, indicating their height above low tide, although they are covered at high tide. ”

“ The tidal information becomes important and must be considered in navigation or in anchoring in waters where the available depth at low water approximates the draft of the vessel. In the general use of coast charts it is also important to observe the effect of the stage of tide on the appearance of many features. Rocks rising some feet above low water may be entirely submerged at high water. In some areas the aspect may be radically changed between high and low water by the baring of extensive shoals or reefs. ”

“ The momentum of the tide running up the centre of the river is in excess of that along the banks, so that the current changes near the shore before it does in the middle, and, as the sea water is of greater specific gravity than the fresh, weighing 64 lb per cubic foot against 62-1/2 lb, it flows up the bed of the river at the commencement of the tide, while the fresh water on the surface is running in the opposite direction. ”

“ From the beach, a little below the foot of the tower, seaward, as far as the eye could reach through the mist and spray, the ocean tossed and rolled. Great hills of water, green and angry, rose as though pushed up from below, their crests lashed into foam and then blown into vapor by the gale; wave succeeded wave, until a mighty host of waters, rank on rank, impelled by the wind, dashed themselves to foam on the ever-resisting shore. ”

“ When the tide begins to flow up the river there may be a low-level salt water current moving landward and a high-level fresh water current moving seaward, but this is quite a temporary state of affairs. The surface slope is landward, and the water moving seaward is not moving in obedience to the surface slope. ”

“ The flood-tide, which commenced at nine o'clock, when the depth was twenty-eight fathoms, gradually ran stronger until midnight, when its rate was two miles per hour: high-water took place at 3 hours 15 minutes a.m., or at twelve minutes before the moon passed her meridian; the rise being thirty-six feet. ”

“ The course of water flowing underground is not strictly analogous to that of rivers on the surface, there being, in the one case, a constant descent from a higher to a lower level from the source of the stream to the sea; whereas, in the other, the water may at one time sink far below the level of the ocean, and afterwards rise again high above it. ”

“ This water is evaporated principally from the torrid zone. Supposing it all to come thence, we shall have encircling the earth a belt of ocean 3000 miles in breadth, from which this atmosphere evaporates a layer of water annually sixteen feet in depth. And to hoist up as high as the clouds, and lower down again, all the water, in a lake sixteen feet deep and 3000 miles broad and 24,000 long, is the yearly business of this invisible machinery. What a powerful engine is the atmosphere! ”

“ Fastening our attention for the moment on surface water waves, the first question we shall ask ourselves is—What is a wave? If we take our station on a high cliff looking down on the sea, on some clear day, when the wind is fresh, we see the waves on its surface like green rounded ridges racing forward, and it appears at first sight as if these elevations were themselves moving masses of water. ”

“ Waves travel at a rate which increases in proportion to their size and the depth of water in which they are formed. Every one knows that on most lakes they are comparatively small and harmless. In some lakes, however, such as Lake Superior in North America, which is upwards of three hundred miles long, the waves are so formidable as to resemble those of the ocean, and they are capable of producing tremendous effects. But the waves of the sea, when roused to their greatest height, and travelling at their greatest speed, are terrible to behold. Their force is absolutely irresistible. ”

“ Thus, between tide-waves and currents, changes are going on continually both in the volume and the physical constitution of the sea-water. And this, which might at first on a hasty glance look like casual and unimportant variation, when we come to consider it attentively, is found to be an arrangement fraught with wisdom and beneficence; for it insures continual variations of temperature, it attracts the purifying storms, restores the elastic spring of the atmosphere, and provides for weary man a healthy tonic breeze when he rambles along the beach or scales the face of the cliff. ”

“ Sand and mud have been brought up from a depth of a hundred fathoms below the surface, and experiments have shown that waves have a vertical influence 350 times their height. Thus a wave a foot high influences the bottom at a depth of 50 fathoms, and a billow of the ocean 33 feet high is felt below at a distance of 1 3/43/4 miles. ”

“ The foam, cast incessantly by the surf upon the rocks and sometimes more than a hundred feet in the air, had filled with sea water a natural cave situated among the high rocks overlooking the excavation. The overflowings of this reservoir caused, a little behind the escarpment, a fall of water of about an inch in breadth, and descending four or five fathoms. An occasional contribution from the rains also helped to fill the reservoir. From time to time a passing cloud dropped a shower into the rocky basin, always overflowing. ”

“ In a suction green as an uncut emerald, a volume of water, twenty fathoms deep, is hurled over a precipice 160 feet high. One hundred million tons of water pass over every hour, with a roar that can be heard ten miles away, and a reverberation that shakes the very earth itself, into the seething cauldron below, shrouded in an eternal mist:—"There is neither speech nor language, but their voices are heard." ”

“ The difference between the perpendicular rise of the water in the day and the night, when there is a spring-tide, is no less than three feet, which, where the tides are so inconsiderable as they are here, is a great proportion of the whole difference between high and low water. ”

“ As we pass a heavy flat ice-floe, we see an interesting sight. The waves are swaying it with a regular rhythm, and spouting up from its very center there is a large column of water which rises twenty to twenty-five meters into the air. The explanation of this strange spring is simple enough. A caprice of nature has formed a hole in the floe, and as the waves rock it, the water presses through the hole with such force that the floe becomes a floating fountain. ”

“ Thus an interposing rock or wall does not form a sharply marked sound-shadow, but there is some deflection of the air waves by the edge of the obstacle. The amount of bending which takes place depends on the length of the wave.
If we take two places on the sea-surface 200 miles apart, the surface of the sea at the halfway distance is just 11⁄4 miles above the straight line joining the places. In other words, the rotundity of the earth interposes a mountain of water 11⁄4 miles high between the places. ”

“ Considering that many of these islets are not three feet above the water-level,—that ten feet is considered high ground, and fifteen is about the maximum elevation,—you can understand how appalling is the danger caused by any eccentricity of tide. ”

“ The in-shore tidal waters having to encounter the shelving shores, islands, sunken rocks, and projecting points of land, which lie in their course up the Firth , acquire lateral as well as perpendicular motion, and being thus checked in their progress, are brought sooner to a maximum state than the off-shore stream, which flows in deeper water, and comparatively free of obstruction, till it reaches its ultimate limits; though it gradually diminishes in breadth, till the stream of the new tide gaining strength becomes general ”

“ To this supremacy in mosses and flowers we have next to add an inestimable gain in the continual presence and power of water. Neither in its clearness, its colour, its fantasy of motion, its calmness of space, depth, and reflection, or its wrath, can water be conceived by a lowlander, out of sight of sea. A sea wave is far grander than any torrent—but of the sea and its influences we are not now speaking; and the sea itself, though it can be clear, is never calm, among our shores, in the sense that a mountain lake can be calm. ”

“ From yonder cleft in the mountain side a volume of water gushes with such energy that as it strikes the ledge lower down it is dashed into silvery spray whose myriad drops fall into the deep, dark pool whose over-flow is tributary to this stream, which flows southward, then eastward, finding entrance into an underground channel at the base of the mountain, where it too curves outward, thence debouching on the further side, where it is joined by other streams, all flowing into a small but pretty lake, which later on you shall see. ”

“ As the height of the confined waters increases, the range of their journey over the bottom as the wave comes and goes rapidly increases. When they have an elevation of ten feet they can probably stir the finer mud on the ocean floor, and in shallow water move yet heavier particles. In the embayments of the land, where a great body of water journeys like an alternating river into extensive basins, the tidal action becomes intense; the current may be able to sweep along large stones quite as effectively as a mountain torrent. ”

“ Quicker than thought the solid lance of dazzling light plunged down through profundity, and the vast abyss of water was revealed along its pathway.
Nothing moved in those tremendous depths except, nearly two miles below, a few spots of tinsel glittered and drifted like flakes of mica.
At first I scarcely noticed them, supposing them to be vast beds of silvery bottom sand glittering under the electric pencil of the hydroscope. But presently it occurred to me that these brilliant specks in motion were not on the bottom—were a little less than two miles deep, and therefore suspended. ”

“ WE have all stood many times by the seashore, watching the waves, crested with white foam, roll in and break upon the rocks or beach. Every one has more than once cast a stone upon still water in a lake or pond, and noticed the expanding rings of ripples; and some have voyaged over stormy seas, whereon great ships are tossed by mighty billows with no more seeming effort than the rocking of a cradle. In all these things we have been spectators of a wave-motion, as it is called, taking place upon a water surface. ”

“ The vast volume of pent-in water meeting all manner of submerged obstacles dashes in zigzag from shore to shore, cannoning off walls of rock until the whole gorge becomes one rushing, gyrating mass of angry water. ”

“ When the tide advances over a sea-beach on a calm and sunny day, and its tiny ripples enter, at various points, the clear shallow pools which the preceding tide had left behind, the little wavelets run and climb and cross each other, and thus form a lovely chasing, which has its counterpart in the lines of light converged by the ripples upon the sand underneath. When waves are skilfully generated in a vessel of mercury, and a strong light reflected from the surface of the metal is received upon a screen, the most beautiful effects may be observed. ”