Modern Painters (of V) Volume IV

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Excerpt: ...are to remain straight, she must obtain the curvature in some other way. Fig. 51. § 9. One way in which she gets it is curiously simple in itself, but somewhat difficult to explain, unless the reader will be at the pains of making a little model for himself out of paste or clay. Hitherto, observe, we have spoken of these crests as seen at their sides, as a Greek helmet is seen from the side of the wearer. By means presently to be examined, these mountain crests are so shaped that, seen in front, or from behind (as a helmet crest is seen in front of or behind the wearer), they present the contour of a sharp ridge, or house gable. Now if the breadth of this ridge at its base remains the same, while its height gradually diminishes from the front of it to the back (as from the top of the crest to the back of the helmet), it necessarily assumes the form of such a quaint gable roof as that shown in profile in Fig. 50 , and in perspective 70 in Fig. 51 , in which the gable is steep at the end farthest off, but depressed at the end nearest us, and the rows of tiles, in consequence, though in reality quite straight, appear to radiate as they retire, owing to their different slopes. When a mountain crest is thus formed, and the concave curve of its front is carried into its flanks, each edge of bed assuming this concave curve, and radiating, 203 like the rows of tiles, in perspective at the same time, the whole crest is thrown into the form Fig. 52 , which is that of the radiating plume required. Fig. 52. Fig. 53. § 10. It often happens, however, that Nature does not choose to keep the ridge broad at the lower extremity, so as to diminish its steepness. But when this is not so, and the base is narrowed so that the slope of side shall be nearly equal everywhere, she almost always obtains her varied curvature of the plume in another way, by merely turning the crest a little round as it descends. I will not confuse the reader by examining the complicated...