第 68 节
作者:双曲线      更新:2022-04-14 11:08      字数:9321
  necessity; therefore his first effort in his struggle with the elements
  should reduce this power to vassalage。 There must be no question of
  supremacy; water must serve mankind。
  Many years ago I published; in the Nile Tributaries of Abyssinia; my
  ideas for the control of the Nile and the submersion of the cataracts by
  a series of weirs; with water…gates for the facility of navigation;
  which with certain modifications will some day assuredly be carried out;
  and will render Egypt the most favoured country of the world; as
  absolute mistress of the river which is now at the same time a tyrant
  and a slave。 The Pedias of Cyprus may during some terrific rainfall
  assume proportions that would convey a most erroneous impression to the
  mind of a stranger; who; upon regarding the boiling torrent
  overspreading a valley of some miles in width in its impetuous course
  towards ancient Salamis; might conclude that it was a river of the first
  importance。 The fact is that no RIVER exists in Cyprus: what should be
  rivers are mere channels; watercourses; brooks; torrents; or any of the
  multifarious names for stream…beds that may be discovered in an English
  dictionary。 At the same time that the natural channels are dry during
  the summer months; through the want of power in the water…head to
  overcome the absorption of the porous soil throughout its course; it
  must not be forgotten that a certain supply exists at the fountain head;
  within practicable distance; which might be stored and led from the
  mountains to the lower lands for the purposes of irrigation。 When we
  reflect that in the proverbially wet climate of England there is a
  considerable difficulty in assuring a supply of wholesome water; and
  that the various water companies have made enormous profits; it is not
  surprising that in a neglected island like Cyprus there should be
  distress in the absence of abundant rain。 The uninitiated in England
  seldom appreciate the labour and expenditure that has supplied the
  response to the simple turning of a tap within an ordinary house。 If
  they would follow the artificial stream from the small leaden pipe to
  the distant reservoir; they would discover that a glen or valley has
  been walled in by a stupendous dam; which imprisons a hill…rivulet
  before it can have descended to the impurities of habitations; and that
  the pressure of waters thus stored at an elevated level forces a supply
  to a town at a distance of many miles。 This same principle might be
  adopted in numerous localities among the mountains of Cyprus; where the
  streams are perennial; but are now exhausted by the absorption of the
  sandy beds before they have time to reach the villages in the lower
  lands。 Iron pipes might be laid to convey a water…supply to certain
  districts; upon which a rate would be levied per acre and the crops
  would be ensured。
  The government at the present moment obtains a revenue in kind; or in a
  money valuation of the corn taken at the threshing…floor; thus in the
  absence of a crop through drought; or other accident; the revenue
  suffers directly together with the owner: no crop; no revenue。 The main
  strength of a country lies in an annual income free from serious
  fluctuations; and the extreme instability of Cyprus is the result of the
  peculiar uncertainty of seasons which is a special feature in its
  meteorological condition。 It is therefore incumbent upon the government;
  as an act of self…preservation; to take such measures of precaution as
  will render certain the supply of water; which is all that is required
  to ensure the average produce of the soil; and thereby to sustain the
  revenue。
  I do not indulge in engineering details; but; from the experience I have
  gained by a personal examination of the localities; I am convinced that
  no difficulty whatever exists that would not be overcome with a very
  moderate outlay。 The mountains are admirably situated; with a watershed
  upon all sides; thus offering the greatest facilities for reservoirs and
  pipes that would radiate in every direction。 This subject will demand a
  careful inquiry by hydraulic engineers; as it is a special branch of the
  profession that requires wide experience; and large sums may be
  fruitlessly expended through ignorance; where a trifling amount well
  administered might achieve great results。
  One of the first necessary steps in an examination of the subterranean
  water…supply of Cyprus will be 〃borings〃 that will test the existence
  of artesian springs。 There are in many portions of the island extensive
  plateaux at high altitudes that would absorb a considerable rainfall; in
  addition to a large superficial area of mountains and hills that would
  exert the requisite pressure to force the water above the surface of a
  lower level upon boring; should it now lie beneath some impervious
  stratum。 Boring will alone solve this question。 Should artesian wells be
  practicable in certain localities; an immense blessing will be conferred
  upon the island。
  In the meantime the native method already described; of connecting
  chains of wells from different springs converging to a main channel or
  subterranean tunnel; is an original form of Cyprian engineering
  thoroughly understood by the population; which should be strenuously
  encouraged。 It is a common fault among English people to ignore the
  value of native methods; and to substitute some costly machinery which
  requires skilled labour and expense in working; this must in time get
  out of order and necessitate delay and extra outlay in repairs;
  generally at a period when the machine is most required。
  It is a curious fact that the shadoof or lever and bucket worked by
  hand; which is so generally used throughout Egypt; is unknown in Cyprus;
  where in many localities it would be easily worked when water is within
  five to eight feet of the surface。 This arrangement only requires a pole
  of about twenty feet in length supported upon an upright post; so as to
  play like a pump…handle by the balance of a weight attached to one end
  to counterbalance the pail of water suspended to a long stick and short
  rope at the other extremity。 In Egypt the weight at the short end is
  merely a mass of clay tempered with chopped straw beaten together to
  represent about 150 lbs。 or whatever may be required; this adheres; and
  forms a knob to the end of the lever。
  A man holds the long thin stick suspended at the other extremity to
  which the bucket is attached; and pulls it down hand over hand until the
  utensil is immersed in the water; when full; it is so nearly
  counterbalanced by the weight at the end of the lever that a very slight
  exertion raises it to the desired level; where it is emptied into a
  receiver。 Many years ago; when at Gondokoro; I arranged a double shadoof
  of parallel levers and two galvanised iron buckets of four gallons each;
  worked by two men。 I timed the labour of this simple machine; and proved
  that the two men delivered 3600 gallons within an hour。 The men exerted
  themselves to a degree that could not have been continued throughout the
  day; and the buckets; of English make; were far more capacious than the
  simple leather stretched upon a hoop of sticks that is used in Egypt;
  but there is no reason for such inferior adjuncts。 It may be safely
  assumed that with proper appliances the double shadoof; worked by two
  men; will deliver 2000 gallons an hour for a working day of six active
  hours; or a total of 12;000 gallons。 In Cyprus the wages of a labourer
  are one shilling a day; therefore the cost of raising 12;000 gallons
  would be only two shillings; provided the water is only five feet from
  the surface。 There are many portions of the Messaria plain where the
  water is even nearer; but the shadoof could work profitably at six; and
  even at eight feet; and it possesses the advantage of such extreme
  cheapness of original cost that the outlay is insignificant。
  Where fuel is expensive; and cattle and human labour cheap; the ancient
  Egyptian water…wheel will deliver a supply at a cheaper rate than steam。
  It has the merit of being always ready; there is no delay in lighting
  fires and getting up the steam; there is no expensive engineer who may
  be sick or absent when required; but the wheel is turned either by night
  or day by mules or oxen; driven by a child。 Wind vanes might be attached
  to this principle; and could be connected on favourable occasions。
  The peculiarity throughout the lower levels in Cyprus (specially
  exhibited in the plain of Messaria) of a water…supply within a few feet
  of the surface; at the same time that the crops may be perishing from
  drought; is in favour of the general adoption of the Egyptian wheel。
  Although this simple construction is one of the oldest inventions for
  raising water; and is generally understood; I may be excused for
  describing it when upon the important topic of irrigation。
  A large pit is sunk to about three feet below the level of the water;
  and should the earth not be sufficiently tenacious for self…support; the
  sides are walled with masonry; this pit would usually be about twenty
  feet long; four feet wide; and twenty feet deep for a first…class wheel。
  When the wooden wheel of about seventeen feet diameter has been fixed
  upon