The Bridge at Windsor, Vt: And Its Economic ImplicationsCodex Book Company, Incorporated, 1926 - 73 páginas |
Termos e frases comuns
1st July abutments amount arched bridges automobile beasts Bellows Falls bolt bottom beams bottom chord braces Bridge Corporation bridges of wood built cattle cents Charles River chart Cheshire Connecticut River Corbel Cornish Bridge cost County of Cheshire crossed Curricle dimensions Dividends Dracut drift-wood dry rot economic Eli Whitney engineer enterprise erected expense feet ferry figures floor beams franchise freshets further enacted Hampshire Haverhill horizontal inches thick inclined inclined plane income increases inheritance estates interest intersection investment Ithiel Town Jonathan Chase June 240 Sept lattice length less load Major Wood miles pass pieces plotted present bridge principal rafters privilege of building proportion proprietors railroad rates of Toll rendered secured sheep side spruce stone strain strength stress string-pieces structure superstructure Tasker and Fletcher tenons timber tion toll bridge top beams town traffic tree-nails truss truss-braces Vermont vote wages weather weight width
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Página 5 - They shall splash at a ten-league canvas with brushes of comets' hair; They shall find real saints to draw from — Magdalene, Peter, and Paul; They shall work for an age at a sitting and never be tired at all! And only the Master shall praise us, and only the Master shall blame ; And no one shall work for money, and no one shall work for fame ; But each...
Página 5 - And only the Master shall praise us, and only the Master shall blame; And no one shall work for money, and no one shall work for fame; But each for the joy of the working, and each, in his separate star, Shall draw the Thing as he sees It for the God of Things as They Are!
Página 5 - WHEN Earth's last picture is painted and the tubes are twisted and dried, When the oldest colours have faded, and the youngest critic has died, We shall rest, and, faith, we shall need it — lie down for an aeon or two, Till the Master of All Good Workmen shall put us to work anew ! And those that were good shall be happy : they shall sit in a golden chair; They shall splash at a ten-league canvas with brushes of comets...
Página 5 - And only the Master shall praise us, And only the Master shall blame; And no one shall work for money, And no one shall work for fame; But each for the joy of the working, And each in his separate star, Shall draw the thing as he sees it, For the God of things as they are.
Página 47 - ... necessary ; this saving in wide arches is very great, sometimes equal to a third part of the whole expense of the bridge. 2. The shrinking of timber has little or no effect as the strain upon each plank of the trusses, both of the braces and string-pieces, is an end-grain strain or lengthwise of the wood. 3. Suitable timber can be easily, procured and sawed at common mills, as it requires no large or long timber — defects in timber may be discovered, and wet and dry rot prevented much more...
Página 49 - ... as experience produces courage, are progressively enlarging their dimensions, nor should I be surprised if genius should in time, produce the mechanic rainbow of one thousand feet Over wide and rapid rivers. In crossing the rivers in such countries as Russia and America, an extensive arch seems to be a consideration of the first importance, as the rivers or even rivulets, in time of rain, suddenly swell to a great height, and in the spring, on breaking up of the ice, the immense quantity which...
Página 49 - ... to the casualties of the weather. The important objection to bridges of wood is their rapid decay, and this objection is certainly well founded when particular situations are alluded to where timber is scarce and consequently expensive. But in such countries as America where wood is abundant, I conceive it will be a fair criterion to judge of their application by calculating on the expense of a bridge of stone, and one of wood, and then compare the interest of the principal saved in adopting...
Página 48 - ... the tenon goes is generally so much as to let the work settle so far as to give a motion or vibration, which, in time, renders them weak and insufficient. 12. Should any kind of arched bridge, for any reason, be preferred, however it may be arched either at top or bottom, or both, still this same mode of combining the materials will have all the advantages as to cheapness and strength, over the common ones of framing, as in case of the horizontal or straight ones before described.
Página 48 - The expense of the superstructure of a bridge would not be more than from one half to two thirds of other modes of constructing one over the same span or opening. This is a very important consideration, especially in the Southern and Western States, where there are many wide rivers, and a very scattered population to defray the expenses of bridges. 11. This mode of securing the braces by so many trunnels gives them much more strength when they are in...
Página 16 - The breadth of the river has been mentioned. The stream is rapid ; and the climate so cold, as to produce, annually, thick and firm ice. But the doubt has vanished. Seven bridges have been built on this stream : and not one of them has been carried away. The defensive piers have proved an effectual security against this evil. These are formed in the figure of a half pyramid ; the base a^emi-rhombus; and are strongly fortified with iron.