The same article says of these old works: "It will give an idea of the labour involved, when it is stated the mechanism of the clock occupies a space of about 5 feet cube (125 cubic feet), that the structure is wholly of forged iron; that the numerous wrought-iron wheels, some of which are nearly 2 feet in diameter and about ½ inch thick, besides having to be made truly circular and concentric, had all their teeth cut out and trimmed to workable shape by hand; and that the heavy wrought-iron frames, etc., are fastened entirely by means of mortise, tenon, and colter, no screws being used in the whole structure. The pinions are of the lantern form, with octagonal cheek-plates on square spindles, and the pendulum of modern form beats seconds." THE INVERTED ARCHES.--Undoubtedly the first thing that the stranger notices in Wells Cathedral, and the last that he is likely to forget, is the curious contrivance by which the central tower is supported. Of the three pairs of arches (the upper arch resting inverted upon the lower) which stretch across the nave and each of the transepts, that in the nave is seen at once, and lends a unique character to the whole church. At first these arches give one something of a shock, so unnecessarily frank are they, so excessively sturdy, so very English, we may think. They carry their burden as a great-limbed labourer will carry a child in a crowd, to the great advantage of the burden, and the natural dissatisfaction of the crowd. In fact, they seem to block up the view, and to deform what they do not hide. That is the first impression, but it does not last for long. Familiarity breeds respect for this simple, strong device, which arrested the fall of the tower in the fourteenth century, and has kept its walls ever since in perfect security, so that the great structure has stood like a rock upon the watery soil of Wells for nearly seven centuries, with its rents and breaks just as they were when the damage was first repaired. The ingenuity, too, of these strange flying buttresses becomes more and more evident; the "ungainly props" are seen to be so worked into the tower they support, that they almost seem like part of the original design of the first builders. One discovers that it is the organ, and not the arches, that really blocks the view, and one marvels that so huge a mass of masonry can look so light as to present, with the great circles in the spandrels where the arches meet, "a kind of pattern of gigantic geometrical tracery." Indeed, I think no one who has been in Wells a week could wish to see the inverted arches removed. Professor Willis, who had made a most careful investigation of the masonry, thus describes the cause and the construction of the inverted arches (_Somerset Proceedings, 1863, i. 21_):