A book of bridges

by Walter Shaw Sparrow

From a guess to a theory; this, then, is the architecture of constructive growth that research and revision build with facts; and if we as pontists wish to think clearly and humanely, we must use facts as a means to a worthy end, as architects employ their materials. One by one facts are to us what a few slates and tiles are to a builder, but Thought collects them, and then with care and inspiration she builds with them as she builds with stones and bricks and timber. In her work, moreover, there is nothing little when she does little things admirably; but when her devotees go away from her and parade guesswork as theory and fact as truth, we should ask them whether brick-kilns are houses and stone quarries cathedrals. To-day, unhappily, most people exalt facts into truths, and very often the great word “theory” is a journalistic term for any supposition that is loose or wayward or foolish. Thus, “Mrs. Jones has a mere theory that her husband is hard at work when he remains in town after office hours.”

From the life of bridges we may draw a great many conjectures, suppositions, speculations, suggestions, fancies, ideas; and here and there we find some attractive hypotheses, notably those that concern the introduction of pointed arches into French bridges, and of ribbed arches into English bridges. Are there any truths, any useful and necessary things that repeat and confirm themselves age after age? Yes. There are some technical truths that belong for all time to the mechanics of bridge building; the world can employ them for ever, and always with the same good results, if engineers and architects work competently. There is also a great social truth in the life of bridges and roads; namely, that types of society are as old as their systems of circulation, just as women and men are as old as their arteries. So the condition of a body social can be judged accurately if we examine with care its landways and waterways. In Spain, for example, where the genius of modernity is inactive, and where fine bridges represent many dead social states, Roman, Moorish, Mediæval, and Renaissance, the past reigns over the highways, sometimes as an inspiration, as in the great and vast bridge at Ronda, but usually as a mournful historian. Even in those parts of Spain where trade endeavours to be modern, workmen have time enough to be honest craftsmen; their metal bridges are not uncouth, and their stone bridges are charmed with hints taken from classic models. They do not “progress,” for they keep far off from that spirit of trade which regards the lies of advertising as proofs of a pushful honour. From a modern standpoint, then, Spain does not live except as a dim reflexion of her long ago.

A pontist has few theories to consider, only two, indeed, and these are sisters. Let me introduce you to them.

A BROKEN WAR-BRIDGE OF THE XIII CENTURY, AT NARNI IN ITALY; REPAIRED WITH WOOD

II

STRIFE AND HISTORIC BRIDGES

The first theory sets thought astir on the necessity of having landways and waterways which in all respects are fitted to distribute the many functional activities of military and civil life. It is not enough that a complex type of society should have many intricate systems of circulation for its multiform traffic. The weakest points in each system ought to be regarded as danger zones in the strategy of national defence, so it is a duty to protect them from attack, and the protection should be as complete as the military arts can make it, age after age. Now the most vulnerable points in a system of landways are the long bridges by which roads and railways are conducted across wide chasms, and deep valleys, and perilous waterways. Yet in England, and in other countries also, neither roads nor railways are defended; indeed, modern bridges are not only unfortified, but as sensitive to bombs as elephants are to large bullets. Why has the world forgotten that a powerful nation whose bridges were cut would be like a giant whose arteries were severed? As the suffragettes burnt down Yarmouth pier, so a conspiracy of civil disorder, acting in accordance with a well-formed plan, could in a night, with a few sappers, cripple a vast railway, by blowing up the main strategic bridges. I am giving a chapter to this urgent subject, most engineers having evaded with equal zest the charm of beauty and the security of our food supplies. At a time when the nations overarm themselves for war, tradesmen and engineers have erected ugly bridges for an imagined peace; but now that the art of flying threatens civilization from overhead and from all around, like a new Satan, the public attitude to highways cannot remain lethargic. Willingly or unwillingly, we must recall and renew those principles of defensive war with the help of which bridges were safeguarded by the Romans and also in the Middle Ages. Frank Brangwyn has painted many aged fortified bridges, making a most varied selection; and in each of these historic pictures he illustrates the attitude of old times to the theory of pontine defence.

The apathy of the public has been unintelligent, but not unintelligible, because bridges and roads are so ordinary, so very trite, that we who use them every day do not think of their supreme influence on the nation’s health and safety. They belong to that realm of custom where truths fall asleep in truisms and facts in platitudes. To understand a thing that seems obvious, or “inevitable,” is among the problems that genius alone can solve in a complete way. Dr. Johnson believed that men and women could marry ugliness without being in the least intrepid, because custom would soon teach them not to know the difference between good looks and bad. As custom dulls our minds even in family life, where affection is most watchful, we cannot be surprised that common roads and bridges are too evident to be seen intelligently.