Page:Ware - The American Vignola, 1920.djvu/18

8 VIGNOLA'S ORDERS—PLATE II PLATE II shows the proportions of the Orders according to Vignola, in terms of the lower diameter of the columns. These vary in height from seven diameters to ten.

.— It is worth noting that, in ordinary handwriting, the T, for Tuscan, looks like a 7; D, for Doric, like an 8; I, for Ionic, like a 9; Co, for Corinthian and Composite reminds one of 10. The Entablature is in all of them ordinarily one-fourth the height of the column, but it is sometimes made as small as one-fifth. The projection of the Cornice is the same as its height, except in the Doric Order, where it is greater. The lower band of the Architrave is made to come in line with the upper face of the shaft.

But it is only when seen in elevation that these relations obtain. When seen in perspective, as is generally the case, the cornice appears much larger, in proportion, and the frieze and architrave, being foreshortened, much smaller, and the architrave overhangs the shaft, Figs. 53 and 57.

In the Greek Orders, the Column is from five to ten diameters in height and the Entablature always about two diameters. In the Greek Orders, accordingly, the taller the Column, the lighter the Entablature, relatively; but in the Roman Orders, the taller the Column, the heavier the Entablature, actually. It follows that the weight of the Greek Entablature is proportioned to the diameter of the Column, irrespective of its height; of the Roman to the height of the Column, regardless of its diameter. The Romans put the least weight on the shortest and strongest supports. The Greek plan shows more regard to principles of construction, the Roman to principles of decorative composition.

Vignola used half of the lower diameter of the Column as his unit of measure, or Module. This he divided into twelve Parts for the Tuscan and Doric Orders, and into eighteen Minutes for the others, and he gives all the dimensions both of the larger members and of the moldings in terms of Modules and Parts, or Minutes, sometimes using even the quarter Minute, or one one-hundred-and-forty-fourth of a Diameter. But it is equally practicable and more convenient to use the whole Diameter as a unit of measure, dividing it only into Fourths and Sixths, and occasionally using an Eighth or a Twelfth.

In Plates IV, VI, VII, IX, XI, and XIII, the first column on the left shows the vertical dimensions as given in Plate II. In the second column, these divisions are subdivided into equal parts, the third column giving a further division of the dimensions thus obtained. Most of these dimensions can be stated in terms of sixths or fourths of the Diameter, as appears in the Tables. This analysis does not reach the smaller details, the shape and size of which must be learned by observation. Indeed, all these forms should be made so familiar that they can be drawn accurately from memory, these arithmetical relations being used only to test the accuracy of the result, or to discover how much the proportions adopted in any given case differ from the regular type. For Vignola's Orders are to be regarded only as an admirable standard that may be safely adopted when there is no occasion to do anything else, but which is to be departed from and varied whenever there is any reason for doing so. Vignola obviously so regarded them. He did not himself adhere closely to his own rules, or generally adopt his Orders in his own work. His Doric and Ionic are to be found, however, in the Villa Caprarola.