Part 10

"The conception of such an effect, difficult even to the artist accustomed to abstract his attention from present interruptions and to calculate future harmonies, is impossible to the uninstructed spectator, who, from the experimental decoration of a single column, draws a premature and, necessarily, a fallacious inference as to the collective effect of the whole.

"From my brother architects I hope for a more patient, a more comprehensive, and a fairer appreciation; for myself, I have a confident hope, grounded on the experience of years devoted to this particular branch of art, that the principles and plans I have had the honour to propose to the Royal Commission, for the decoration of this magnificent structure, will be found, when complete, not to disappoint the public expectations, or to prove wholly unworthy of the great occasion."

In this lecture, Mr. Owen Jones asked his hearers, and the public generally, to suspend their final judgment upon his system of colouring until the whole should be completed, and the building filled with the objects to be exhibited, as he considered that many of the objections which were raised to his proposition resulted from a want of consideration of the ultimate effect to be produced by the whole, when completed and occupied; and so far as this effect has been realised, we believe it has inclined the public opinion more in favour of the coloured decoration than originally, when it was undoubtedly very strongly commented upon in various quarters. Without venturing to express any opinion ourselves, we may trust that Mr. Owen Jones's fondest hopes will be fully realised.

The Water Supply.

The supply of water necessary both for the protection of this enormous building from fire, and for the use of fountains and machinery to be exhibited, is furnished at a very liberal rate by the Chelsea Waterworks' Company. It is brought into the building by a 9-inch main pipe, at about the centre of its length, branching out into three 6-inch pipes, which extend throughout the whole length of the building. Short pipes branch off from these, terminating in fire-cocks, placed at such distances that a circle of 120-feet radius from any one of them will touch a similar circle described round the adjacent ones; by which means the whole extent of the building may be brought under the action of hose attached to each of the fire-cocks. The water is supplied at a pressure equal to a column of about seventy feet, so as to work the fountains that will be exhibited, and to play efficiently from hose in case of any accident by fire. The quantity which the Company have undertaken to supply is 300,000 gallons a day.

The Stability of the Building.

The subject of the strength and stability of the building is one on which considerable anxiety has been felt, both by the public at large and by those professional bodies more capable of forming a correct judgment upon it. In the prolonged discussion which followed the reading of Mr. Wyatt's paper at the Institution of Civil Engineers, many points of objection were raised which seemed at first sight of a very serious nature; but, in most cases, the answers that were given to them were perfectly satisfactory. The two greatest difficulties raised were, firstly, the enormous surface presented by the exterior to the pressure of the wind, with apparently but a slight power of resistance; and, secondly, the construction of the galleries, which, it was thought, would not be able to resist the vibratory motion likely to be produced by great numbers of people walking upon them. The results of several calculations were adduced on the occasion alluded to in support of the objections on the first point; but perhaps the best answer that could be given to them was the circumstance mentioned by Mr. Fox--that on the 5th of that month (January) the pressure of the wind, which blew a perfect gale, was not only much above the average, but very nearly reached the greatest amount known within a considerable period in London--about 25lbs. per square foot; and that as the building, although in an incomplete state, had resisted that pressure without receiving any injury, it was fair to conclude that, when finished, it would be able to sustain the greatest force which the wind could be reasonably expected to exert upon it.

The question of the strength of the galleries was one of even greater importance than the other, as, in case of any failure in that part of the building, human life must almost inevitably have been sacrificed to a great extent. It was therefore deemed necessary to ascertain, as far as was practicable, by experiment, that their strength was abundantly sufficient; and in Mr. Wyatt's paper, as printed, the following description of the experiments instituted for this purpose will be found.

Testing the Galleries.

In the interval between the reading of this paper and its going to press a series of experiments have been tried to ascertain the action of these galleries under the strain of a moving load. A complete bay, twenty-four feet square, was constructed, raised slightly from the ground, consisting of the four cast-iron girders, with the connecting-pieces at the angles, and on this the timbers and boards of the flooring. Rows of planks the full width of the platform led up to it and down from it, so that a body of men as wide as the gallery might be able to march up and down in close rank.

"The area of the platform was first covered over with labourers packed as closely together as possible; but no action of walking, running, or jumping that 300 men could perform did any injury whatever to it, and the greatest deflection of the girders did not exceed a quarter of an inch. Soldiers of the corps of Royal Sappers and Miners were then substituted for the contractors' men; and although the perfect regularity of their step in marking time sharply appeared a remarkably severe test, a minute examination of the construction after the completion of the experiments showed that no damage whatever had been done by their evolutions.

"But as the Commissioners were deeply impressed with the necessity of thoroughly convincing the public, who should visit the Exhibition, that they might feel perfectly secure in every part of the building, it was deemed desirable to apply a still further test to the actual galleries as they stand; as it might perhaps be said that the single bay which had been experimented upon was not similarly circumstanced to those forming parts of the building.

"For this purpose a very ingenious apparatus was devised by the late Mr. Field, President of the Institution of Civil Engineers, for testing the stability of the galleries _in situ_, and on being applied over the greater part of the building not a single bolt or girder gave way under its action. This apparatus consisted of eight square wooden frames divided into thirty-six compartments, each just capable of containing and allowing to rotate a 68-pounder shot. The surfaces of the balls placed in each of these compartments came in contact with the gallery floor, the frames themselves being attached to one another and running along the floor by means of castors fixed at the angles; the whole apparatus being drawn along by a number of men. Two hundred and eighty-eight 68-pound shot confined in a limited area were thus set rolling over more than half the extent of the galleries; when, not the slightest mishap having occurred, the experiment was considered decisive, and a persistence in it deemed unnecessary."

The pressure obtained in this experiment amounted to about a hundred pounds per square foot, and it had been ascertained that the greatest pressure caused by packing men together as closely as possible was equal to about ninety-five pounds per square foot; so that the testing force applied was considered amply sufficient, as a considerable portion of the surface of the gallery will be occupied by light articles exhibited in the cases and stalls which are placed along the centre of the gallery, where a great weight would have most effect.

This ingenious method of proving the strength of the galleries _in situ_, without endangering those engaged in the experiment, is admirable; and the result of the proof will no doubt allay all fear in the mind of the public as to the safety of this portion of the building.

General Advantages of the Building.

It is always much easier to point out the defects of any work than its excellences; whilst we may, therefore, safely leave the former, as regards our present subject, to be discovered and enlarged upon by those who may be perhaps more competent than ourselves, we will attempt to point out what we conceive to be some of the advantages obtained in the present building.

One of the principal of these, considering throughout the purpose of the structure, is, perhaps, the uninterrupted view of the interior which the spectator may obtain from any point of the building--a matter of great importance to the general grandeur of its effect. From the galleries more particularly, which will be less obstructed by large objects, the eye of the spectator will be able to range from end to end of the vast edifice; while the transparency of the material used for the roof allows every object to be brilliantly illuminated. The slender lines of the supports, though they serve to sustain a protecting covering, scarcely interrupt the view of the objects protected, and the absence of any fixed divisions or partitions enables all the articles exhibited to be so arranged as to suit the peculiar requirements of each particular class; while the ample space between the supports has admitted of the formation of large open avenues for the free passage of visitors, who may thus reach as readily the remotest corners of the building as those situated near the entrances; and whenever the visitor may find himself fatigued by the labour of sight-seeing, he will be sure to find himself near one of the numerous exit-doors, whereby he may immediately free himself from the crowd of spectators.

From the simplicity of the details of the construction, and their constant recurrence, it will be seen that so long as the ends of the building were left incomplete, its size could easily be limited or expanded, so as to include that precise amount of space which, up to the last moment when the point could be kept open, appeared most likely to be required. This simplicity of arrangement will also be found very advantageous in case the building is removed after the termination of its present temporary purpose; as the parts may be easily separated without much injury, and as readily re-erected, either as a whole, or even in many separate buildings, having the same arrangement of parts, without the same general form or appearance.

It has been calculated that the passages remaining in the building, after deducting the space appropriated to the objects exhibited, will hold more than 100,000 persons; though it is not to be expected that half that number will be collected there at one time. The ventilation and supply of fresh air for so vast a throng was therefore a matter of the first importance; and the means already described for accomplishing this great object are so ample, that any inconvenience from oppressive heat or foul air can hardly be expected. The canvass with which the roof is covered will not only serve to modify the heat of the sun in the interior, but it is expected that if it be watered by the hose of engines, it may even reduce the temperature within to considerably below that of the external air. From his experience in glass-houses for horticultural purposes, Mr. Paxton speaks confidently on this point.

The arrangement of the construction of the building resting on isolated instead of continuous supports, will enable all traces of it to be readily effaced from the site if it is removed; and, on the other hand, if it remains, it is evidently peculiarly suited to form a vast winter-garden and public promenade.

Conclusion.

Before taking leave of the reader who may have patiently followed us thus far, a few words may be necessary on the general arrangement of the articles to be exhibited in the building whose outline and details we have been endeavouring to trace. The first classification is geographical. All the western half of the building is given to England, and the eastern, which is rather the larger of the two, to foreign countries; the space assigned to each country being distinctly defined, so as to avoid the possibility of any disputes. As far as it was possible, the space for each country is so arranged as to have a frontage towards the main central avenue, and in most cases occupies a strip the whole width of the building; the visitor, therefore, passing up and down the length, will not miss out any country.

In the central avenue, and immediately on either side of it, are placed the most remarkable specimens of objects coming under the class of fine-arts, or otherwise sufficiently remarkable to entitle them to such a prominent place. Behind these, in the side avenues, will be found the various specimens of manufactured articles; and along the outside longitudinal avenues are placed, on the south side, those belonging to the class of raw products (a portion being devoted to agricultural implements), and the projecting portion of the building on the north side forms the hall of machinery, which is separated by a partition of glazed sashes from the rest of the building. Many of the articles will be grouped in courts, an arrangement which the construction particularly leads to; and these will probably form some of the greatest attractions in the Exhibition, each being, as it were, complete in itself, and the inclosures preventing the eye from being distracted by distant objects. To enter further into the detail of this part of the subject would be foreign to the purpose of this work, the building itself being our text.

We have now, we believe, completed the pleasant task we proposed to ourselves at the outset, and we hope that in doing so we may have been able to render interesting to our general readers this description of operations, usually occupying the attention of the technical professions only. With this intention, we have avoided as far as possible the use of technical terms, which would be a dead letter to the uninitiated, at the risk, perhaps, of being considered inaccurate by those acquainted with all the details of the subject.

So many men whose eminent talent is well known and appreciated by the public have been engaged in perfecting the designs and carrying out the erection of this vast structure, that the critic should be one of no mean reputation who would venture to raise even a small voice of individual criticism on its merits. We have considered it, therefore, to be our part rather to record the opinions of others on any points where a discussion has been raised than to trouble the reader with any personal views, which would, perhaps, have only appeared impertinent.

The nature and extent of the difficulties which have been successfully surmounted in carrying out this great work can only be fully appreciated by those intimately acquainted with all its structural details and with its rapid progress; and its completion in so short a period must be regarded as a striking instance of the productive power and spirit of commercial enterprise of this country, while the fact of its being defrayed by the voluntary contributions of the people will illustrate in an interesting manner to our continental visitors that principle of self-government which forms the basis of all our institutions, and the spirit of private enterprise which characterises most of our great undertakings.

The illustrative engravings with which we have endeavoured to render more interesting the descriptive details, necessarily somewhat dry to the general reader, are only intended to convey general ideas, without attempting that minute accuracy which would be required in a more technical work; and with reference to some of them we take this opportunity of acknowledging the assistance our artists have derived from views already published elsewhere, others having been exclusively drawn for the present work.

We have much pleasure in presenting our readers, in the Appendix, with views and descriptions of two of the most striking designs sent in the first competition for the building, the materials for which have been kindly afforded us by their respective authors; and we may remind the reader that these two designs were specially mentioned by the Building Committee in their Report already quoted. In the same place some interesting documents connected with the building will also be found, which we were unable to insert in the text.

APPENDIX.

LIST OF COMPETITORS FOR THE BUILDING PROPOSED TO BE ERECTED IN HYDE PARK.