months before his death, that for some time
previous to the opening
of the
bridge, his
anxiety was so great that he could scarcely
sleep; and that a
continuance of that condition must have very soon
completely undermined his health. We are not,
therefore, surprised
to learn that when his friends rushed to
congratulate him on the
result of the first day's experiment, which decisively proved the
strength and solidity of the
bridge, they should have found the
engineer on his knees engaged in prayer. A vast load had been
taken off his mind; the
perilousenterprise of the day had been
accomplished without loss of life; and his
spontaneous act was
thankfulness and gratitude.
[Image] Menai Bridge
The
suspension of the remaining fifteen chains was
accomplishedwithout difficulty. The last was raised and fixed on the 9th of
July, 1825, when the entire line was completed. On fixing the final
bolt, a band of music descended from the top of the
suspension pier
on the Anglesea side to a scaffolding erected over the centre of
the curved part of the chains, and played the National Anthem
amidst the cheering of many thousand persons assembled along the
shores of the Strait: while the
workmen marched in
procession along
the
bridge, on which a
temporaryplatform had been laid, and the
St. David steam-packet of Chester passed under the chains towards
the Smithy Rocks and back again, thus re-opening the
navigation of
the Strait.
In August the road
platform was commenced, and in September the
trussed
bearing bars were all suspended. The road was constructed
of
timber in a
substantial manner, the planking being spiked
together, with layers of
patent felt between the planks, and the
carriage way being protected by oak guards placed seven feet and a
half apart. Side railings were added; the toll-houses and
approach-roads were completed by the end of the year; and the
bridge was opened for public
traffic on Monday, the 30th of January,
1826, when the London and Holyhead mailcoach passed over it for the
first time, followed by the Commissioners of the Holyhead roads,
the engineer, several stage-coaches, and a
multitude of private
persons too numerous to mention.
We may
briefly add a few facts as to the quantities of materials
used, and the dimensions of this
remarkablestructure. The total
weight of iron was 2187 tons, in 33,265 pieces. The total length of
the
bridge is 1710 feet, or nearly a third of a mile; the distance
between the points of
suspension of the main
bridge being 579 feet.
The total sum expended by Government in its
erection, including the
embankment and about half a mile of new line of road on the
Caernarvon side, together with the toll-houses, was 120,000L.
Notwithstanding the wonders of the Britannia Bridge subsequently
erected by Robert Stephenson for the passage across the same
straitof the Chester and Holyhead Railway, the Menai Bridge of Telford is
by far the most
picturesque object. "Seen as I approached it," says
Mr. Roscoe, "in the clear light of an autumnal
sunset, which threw
an autumnal splendour on the wide range of hills beyond, and the
sweep of
richly variegated groves and plantations which covered
their base--the bright sun, the rocky
picturesque foreground,
villas, spires, and towers here and there enlivening the prospect--
the Menai Bridge appeared more like the work of some great magician
than the mere result of man's skill and industry."
[Image] Conway Suspension Bridge
Shortly after the Menai Bridge was begun, it was determined by the
Commissioners of the Holyhead road that a
bridge of similar design
should be built over the estuary of the Conway, immediately
opposite the old castle at that place, and which had
formerly been
crossed by an open ferry boat. The first stone was laid on the
3rd of April, 1822, and the works having proceeded satisfactorily,
the
bridge and embankment approaching it were completed by the summer
of 1826. But the operations being of the same kind as those
connected with the larger
structure above described, though of a
much less difficult
character, it is unnecessary to enter into any
details as to the several stages of its
construction. In this
bridge the width between the centres of the supporting towers is
327 feet, and the
height of the under side of the
roadway above
high water of spring tides only 15 feet. The heaviest work was an
embankment as its eastern approach, 2015 feet in length and about
300 feet in width at its highest part.
It will be seen, from the view of the
bridge given on the opposite
page, that it is a highly
picturesquestructure, and combines,
with the estuary which it crosses, and the ancient castle of Conway,
in forming a
landscape that is
rarely equalled.
Footnotes for Chapter XII.
*[1] In an article in the 'Edinburgh Review,' No. exli., from the
pen of Sir David Brewster, the
writer observes:--"Mr. Telford's
principle of suspending and laying down from above the centering of
stone and iron
bridges is, we think, a much more
fertile one than
even he himself
supposed. With modifications, by no means
considerable, and certainly
practicable, it appears to us that the
voussoirs or archstones might themselves be laid down from above,
and suspended by an
appropriatemechanism till the keystone was
inserted. If we suppose the centering in Mr. Telford's plan to be
of iron, this centering itself becomes an iron
bridge, each rib of
which is
composed of ten pieces of fifty feet each; and by
increasing the number of suspending chains, these separate pieces
or voussoirs having been
previously joined together, either
temporarily or
permanently, by
cement or by clamps, might be laid
into their place, and kept there by a single chain till the road
was completed. The voussoirs, when united, might be suspended from
a general chain across the archway, and a
platform could be added
to
facilitate the operations." This is as nearly as possible the
plan afterwards revived by Mr. Brunel, and for the
originality of
which, we believe, he has generally the credit, though it clearly
belongs to Telford.
*[2] A
correspondent informs us of a still more foolhardy exploit
performed on the occasion. He says, "Having been present, as a boy
from Bangor grammar school, on the 26th of April, when the first
chain was carried across, an
incident occurred which made no small
impression on my mind at the time. After the chain had reached its
position, a
cobbler of the neighbourhood crawled to the centre of
the curve, and there finished a pair of shoes; when, having
completed his task, he returned in safety to the Caernarvon side!
I need not say that we schoolboys appreciated his feat of
foolhardiness far more than Telford's master work."
CHAPTER XIII.
DOCKS, DRAINAGE, AND BRIDGES.
It will have been observed, from the
precedingnarrative, how much
had already been
accomplished by skill and industry towards opening
up the material resources of the kingdom. The stages of
improvementwhich we have recorded indeed
exhibit a
measure of the vital energy
which has from time to time existed in the nation. In the earlier
periods of
engineering history, the war of man was with nature.
The sea was held back by embankments. The Thames, instead of being
allowed to overspread the wide marshes on either bank, was confined
within
limited bounds, by which the
navigable depth of its channel
was increased, at the same time that a wide
extent of land was
rendered
available for agriculture.
In those early days, the great object was to render the land more
habitable, comfortable, and
productive. Marshes were reclaimed, and
wastes subdued. But so long as the country remained
comparativelyclosed against
communication, and
intercourse was restricted by the
want of
bridges and roads,
improvement was
extremely slow.
For, while roads are the
consequence of civilisation, they are also
among its most
influential causes. We have seen even the blind
Metcalf
acting as an
effectiveinstrument of progress in the
northern counties by the
formation of long lines of road. Brindley
and the Duke of Bridgewater carried on the work in the same
districts, and conferred upon the north and north-west of England
the blessings of cheap and
effective water
communication. Smeaton
followed and carried out similar
undertakings in still remoter
places, joining the east and west coasts of Scotland by the Forth
and Clyde Canal, and building
bridges in the far north. Rennie made
harbours, built
bridges, and hewed out docks for
shipping, the
increase in which had kept pace with the growth of our home and
foreign trade. He was followed by Telford, whose long and busy