This problem is exactly like the problem of the arched door way in the Ionic order except for the fact that the proportions and details are those of the Corinthian Order. The distance 3 En.-40 from center to center of the columns is the only dimension given for this plate. The student is expected to obtain all the other necessary dimensions from his study of the preceding' plates.
144. In drawing this problem, which will be on a smaller scale than the Corinthian Order plates drawn before, the student should pay particular attention to the proportions of the parts. Some little difficulty may be experienced in laying out the smaller members. While at such a scale it may seem impracticable to draw these members in their true relative size, still, the general proportions of the details of the order may be clearly indicated, if carefully studied and drawn. The sheet should be 20" X28". This size is given so that the student will expeiience as little difficulty as possible with the smaller members and still have the drawing of a convenient size. Begin by drawing a vertical center line and on each side of this lay out the center lines of the columns.
145. This exercise reqiiires that the student use the Tuscan Order shown in Fig. 6, and the details shown in Plate II. This order is required because it will be found easier to use in these early problems on account of the large scale of the mouldings and the few lines required in their delineation. It is to be drawn out to the size of 13' X18' and is to follow in appearance and arrange ment, Plate XXIII. On this plate the plan is completely shown, while the elevation is merely blocked out in the •rough, in order that the student in completing it may have independent practice in the use of the order.
This problem displays the inner corner of a square or rectan gular court yard, which is surrounded by an arcade composed of the Tuscan pilaster and The floor of the gallery is raised three steps of fifteen parts each•above the level of the court.
146. The gallery is vaulted with semi-circular vaults; that is, vaults whose form is a semi-circumference. A vault formed of a semi-circular arch, without penetrations throughout Sits whole length, is called a barrel vault. Two vaults of the same
radius which intersect each other form what is called a.groined vault, because of the hips or groins which mark their intersection. The vaults over this gallery are barrel vaults, which, by their inter sections at the angle's as well as by the penetrations of the barrel vaults which correspond to the arches of the gallery, form groined vaults. The dotted diagonal lines on the plan show the groins of the vaults. The width of the gallery is two entablatures and forty parts, this width being equal to the distance between the pilasters of the facade. The groined vaults are separated by a space of fifty-five parts, that is, a distance equal to the width.of the pilaster.
147. This exercise is to be drawn out at the same size as the one just given, 13"X18', and the plate numbered XXIV is to be accurately copied. The subject of this exercise is a gallery in the Doric Order with arches, surrounding a court or garden. The arches rest upon pieis, decorated on their faces with a couple of pilasters spaced under alternate triglyphs. The space between the pilasters, occupied by the arches of the arcade, is determined by the spacing of the triglyphs, four of which occur over the arches. These pilasters are repeated in the interior of the gallery, which is covered by a flat ceiling, supported by an entablature whose details are shown on the lower portion of the plate. The ceiling over the corner is separated from that of the rest of the gallery by entablatures and arches resting on pilasters advancing from the•faces of the corner piers. This combination is shown in dotted lines on the plan. The gallery arches are repeated on the blank wall which encloses the gallery. The exterior entablature is surmounted by a plain parapet or balustrade, as the roof of the gallery is flat and would be accessible from the second story of the edifice.
148. This exercise is fully drawn out in Prate XXV, and should be copied by the student at the same size as the ones just preceding. In this example we have shown a gallery with colon nade; no arches being employed in the problem.