8. Thus, over each portion of the architrave two metopes and two triglyphs[3] will be placed; and, in addition, at the corners half a triglyph and besides a s.p.a.ce large enough for a half triglyph. At the centre, vertically under the gable, there should be room for three triglyphs and three metopes, in order that the centre intercolumniation, by its greater width, may give ample room for people to enter the temple, and may lend an imposing effect to the view of the statues of the G.o.ds.
[Note 3: That is: two metopes with a triglyph between them, and half of the triglyph on either side.]
9. The columns should be fluted with twenty flutes. If these are to be left plane, only the twenty angles need be marked off. But if they are to be channelled out, the contour of the channelling may be determined thus: draw a square with sides equal in length to the breadth of the fluting, and centre a pair of compa.s.ses in the middle of this square.
Then describe a circle with a circ.u.mference touching the angles of the square, and let the channellings have the contour of the segment formed by the circ.u.mference and the side of the square. The fluting of the Doric column will thus be finished in the style appropriate to it.
10. With regard to the enlargement to be made in the column at its middle, let the description given for Ionic columns in the third book be applied here also in the case of Doric.
Since the external appearance of the Corinthian, Doric, and Ionic proportions has now been described, it is necessary next to explain the arrangements of the cella and the p.r.o.naos.
CHAPTER IV
THE CELLA AND p.r.o.nAOS
1. The length of a temple is adjusted so that its width may be half its length, and the actual cella one fourth greater in length than in width, including the wall in which the folding doors are placed. Let the remaining three parts, const.i.tuting the p.r.o.naos, extend to the antae terminating the walls, which antae ought to be of the same thickness as the columns. If the temple is to be more than twenty feet in width, let two columns be placed between the two antae, to separate the pteroma from the p.r.o.naos. The three intercolumniations between the antae and the columns should be closed by low walls made of marble or of joiner"s work, with doors in them to afford pa.s.sages into the p.r.o.naos.
2. If the width is to be more than forty feet, let columns be placed inside and opposite to the columns between the antae. They should have the same height as the columns in front of them, but their thickness should be proportionately reduced: thus, if the columns in front are in thickness one eighth of their height, these should be one tenth; if the former are one ninth or one tenth, these should be reduced in the same proportion. For their reduction will not be discernible, as the air has not free play about them. Still, in case they look too slender, when the outer columns have twenty or twenty-four flutes, these may have twenty-eight or thirty-two. Thus the additional number of flutes will make up proportionately for the loss in the body of the shaft, preventing it from being seen, and so in a different way the columns will be made to look equally thick.
[Ill.u.s.tration: VITRUVIUS" TEMPLE PLAN COMPARED WITH ACTUAL EXAMPLES]
3. The reason for this result is that the eye, touching thus upon a greater number of points, set closer together, has a larger compa.s.s to cover with its range of vision. For if two columns, equally thick but one unfluted and the other fluted, are measured by drawing lines round them, one line touching the body of the columns in the hollows of the channels and on the edges of the flutes, these surrounding lines, even though the columns are equally thick, will not be equal to each other, because it takes a line of greater length to compa.s.s the channels and the flutes. This being granted, it is not improper, in narrow quarters or where the s.p.a.ce is enclosed, to use in a building columns of somewhat slender proportions, since we can help out by a duly proportionate number of flutings.
4. The walls of the cella itself should be thick in proportion to its size, provided that their antae are kept of the same thickness as the columns. If the walls are to be of masonry, let the rubble used be as small as possible; but if they are to be of dimension stone or marble, the material ought to be of a very moderate and uniform size; for the laying of the stones so as to break joints will make the whole work stronger, and their bevelled edges, standing up about the builds and beds, will give it an agreeable look, somewhat like that of a picture.
CHAPTER V
HOW THE TEMPLE SHOULD FACE
1. The quarter toward which temples of the immortal G.o.ds ought to face is to be determined on the principle that, if there is no reason to hinder and the choice is free, the temple and the statue placed in the cella should face the western quarter of the sky. This will enable those who approach the altar with offerings or sacrifices to face the direction of the sunrise in facing the statue in the temple, and thus those who are undertaking vows look toward the quarter from which the sun comes forth, and likewise the statues themselves appear to be coming forth out of the east to look upon them as they pray and sacrifice.
2. But if the nature of the site is such as to forbid this, then the principle of determining the quarter should be changed, so that the widest possible view of the city may be had from the sanctuaries of the G.o.ds. Furthermore, temples that are to be built beside rivers, as in Egypt on both sides of the Nile, ought, as it seems, to face the river banks. Similarly, houses of the G.o.ds on the sides of public roads should be arranged so that the pa.s.sers-by can have a view of them and pay their devotions face to face.
CHAPTER VI
THE DOORWAYS OF TEMPLES
1. For the doorways of temples and their casings the rules are as follows, first determining of what style they are to be. The styles of portals are Doric, Ionic, and Attic.
In the Doric, the symmetrical proportions are distinguished by the following rules. Let the top of the corona, which is laid above the casing, be on a level with the tops of the capitals of the columns in the p.r.o.naos. The aperture of the doorway should be determined by dividing the height of the temple, from floor to coffered ceiling, into three and one half parts and letting two and one half[4] thereof const.i.tute the height of the aperture of the folding doors. Let this in turn be divided into twelve parts, and let five and a half of these form the width of the bottom of the aperture. At the top, this width should be diminished, if the aperture is sixteen feet in height, by one third the width of the door-jamb; if the aperture is from sixteen to twenty-five feet, let the upper part of it be diminished by one quarter of the jamb; if from twenty-five to thirty feet, let the top be diminished by one eighth of the jamb. Other and higher apertures should, as it seems, have their sides perpendicular.
[Note 4: Codd. _duae._]
2. Further, the jambs themselves should be diminished at the top by one fourteenth of their width. The height of the lintel should be equivalent to the width of the jambs at the top. Its cymatium ought to be one sixth of the jamb, with a projection equivalent to its height. The style of carving of the cymatium with its astragal should be the Lesbian. Above the cymatium of the lintel, place the frieze of the doorway, of the same height as the lintel, and having a Doric cymatium and Lesbian astragal carved upon it. Let the corona and its cymatium at the top of all be carved without ornamentation, and have a projection equal to its height. To the right and left of the lintel, which rests upon the jambs, there are to be projections fashioned like projecting bases and jointed to a nicety with the cymatium itself.
3. If the doorways are to be of the Ionic style, the height of the aperture should be reached in the same manner as in the Doric. Let its width be determined by dividing the height into two and one half parts and letting one of them form the width at the bottom. The diminutions should be the same as for Doric. The width of the faces of the jambs should be one fourteenth of the height of the aperture, and the cymatium one sixth of the width. Let the rest, excluding the cymatium, be divided into twelve parts. Let three of these compose the first fascia with its astragal, four the second, and five the third, the fasciae with their astragals running side by side all round.
4. The cornices of Ionic doorways should be constructed in the same manner as those of Doric, in due proportions. The consoles, otherwise called brackets, carved at the right and left, should hang down to the level of the bottom of the lintel, exclusive of the leaf. Their width on the face should be two thirds of the width of the jamb, but at the bottom one fourth slenderer than above.
Doors should be constructed with the hinge-stiles one twelfth of the width of the whole aperture. The panels between two stiles should each occupy three of the twelve parts.
5. The rails will be apportioned thus: divide the height into five parts, of which a.s.sign two to the upper portion and three to the lower; above the centre place the middle rails; insert the others at the top and at the bottom. Let the height of a rail be one third of the breadth of a panel, and its cymatium one sixth of the rail. The width of the meeting-stiles should be one half the rail, and the cover-joint two thirds of the rail. The stiles toward the side of the jambs should be one half the rail. If the doors have folds in them, the height will remain as before, but the width should be double that of a single door; if the door is to have four folds, its height should be increased.
[Ill.u.s.tration: VITRUVIUS" RULE FOR DOORWAYS COMPARED WITH TWO EXAMPLES]
6. Attic doorways are built with the same proportions as Doric. Besides, there are fasciae running all round under the cymatia on the jambs, and apportioned so as to be equal to three sevenths of a jamb, excluding the cymatium. The doors are without lattice-work, are not double but have folds in them, and open outward.
The laws which should govern the design of temples built in the Doric, Ionic, and Corinthian styles, have now, so far as I could arrive at them, been set forth according to what may be called the accepted methods. I shall next speak of the arrangements in the Tuscan style, showing how they should be treated.
CHAPTER VII
TUSCAN TEMPLES
1. The place where the temple is to be built having been divided on its length into six parts, deduct one and let the rest be given to its width. Then let the length be divided into two equal parts, of which let the inner be reserved as s.p.a.ce for the cellae, and the part next the front left for the arrangement of the columns.
2. Next let the width be divided into ten parts. Of these, let three on the right and three on the left be given to the smaller cellae, or to the alae if there are to be alae, and the other four devoted to the middle of the temple. Let the s.p.a.ce in front of the cellae, in the p.r.o.naos, be marked out for columns thus: the corner columns should be placed opposite the antae on the line of the outside walls; the two middle columns, set out on the line of the walls which are between the antae and the middle of the temple; and through the middle, between the antae and the front columns, a second row, arranged on the same lines.
Let the thickness of the columns at the bottom be one seventh of their height, their height one third of the width of the temple, and the diminution of a column at the top, one fourth of its thickness at the bottom.
[Ill.u.s.tration: THE TUSCAN TEMPLE ACCORDING TO VITRUVIUS.]
3. The height of their bases should be one half of that thickness. The plinth of their bases should be circular, and in height one half the height of the bases, the torus above it and conge being of the same height as the plinth. The height of the capital is one half the thickness of a column. The abacus has a width equivalent to the thickness of the bottom of a column. Let the height of the capital be divided into three parts, and give one to the plinth (that is, the abacus), the second to the echinus, and the third to the necking with its conge.
4. Upon the columns lay the main beams, fastened together, to a height commensurate with the requirements of the size of the building. These beams fastened together should be laid so as to be equivalent in thickness to the necking at the top of a column, and should be fastened together by means of dowels and dove-tailed tenons in such a way that there shall be a s.p.a.ce two fingers broad between them at the fastening.
For if they touch one another, and so do not leave airholes and admit draughts of air to blow between them, they get heated and soon begin to rot.
5. Above the beams and walls let the mutules project to a distance equal to one quarter of the height of a column; along the front of them nail casings; above, build the tympanum of the pediment either in masonry or in wood. The pediment with its ridgepole, princ.i.p.al rafters, and purlines are to be built in such a way that the eaves shall be equivalent to one third of the completed roof.
CHAPTER VIII
CIRCULAR TEMPLES AND OTHER VARIETIES