How to Study Architecture

by Charles H. Caffin

The Romans, on the other hand, with their general use of arch and vaulting, were independent of natural assistance and usually built their circuses and amphitheatres and theatres in the open.

Circus.—The Roman circus was an adaptation of the Hellenic Stadium, which, however, was used chiefly for athletic games, while the Circus was employed for horse and chariot races. The oldest was the Circus Maximus, situated between the Palatine and Aventine; but the one of which most remains have been preserved is the Circus Maxentius, near the tomb of Cæcilia Metella on the Appian Way. Its plan presents a long rectangle terminating at one end in a semicircle. Surrounding this were tiers of marble seats, supported by raking vaults and an external wall of concrete. At the square end were situated the Carceres or stables and down the centre of the rectangle ran a spina or barricade, with a meta or post at each end to mark the turning points. “To graze the meta” was a Roman saying for the taking of great chances. The course was seven times round and on the top of the spina were oval objects, one of which was removed on the completion of each lap of the race.

Amphitheatre.—The most magnificent of the amphitheatres was the Flavian, known since the eighth century as the Colosseum, probably from the colossal statue of Nero which once adorned it. Its plan is elliptical, the main axis being about 615 feet and the shorter about 510 feet; while the arena, which is oval, is 281 feet long by 177 feet wide. The number of spectators that it could accommodate has usually been stated as 87,000; but the calculation is now said to have been based on a misapprehension of the records and has been corrected to 45,000 seats and standing room for 5000.

The exterior comprises four stories. The three lower are composed of arches supported by intermediate piers which are ornamented with columns, respectively, of the Tuscan, Ionic, and Corinthian orders. The fourth story, which, when the amphitheatre was completed in A.D. 82, appears to have been of wood, presents a wall adorned with Corinthian pilasters. Between these, projecting from the cornice, were corbels, pierced to hold the poles that sustained the velarium or awning. The imposing character of the exterior is due not only to the structure’s immense size, but to the difference in unity secured by the application of the three orders, and to the magnificently sweeping lines of the entablatures.

The interior shows the arena surrounded by a smooth wall, above which the seats rise in concentric tiers to the height of two stories. Here they are bounded by a wall, through which are entrances to the seats while it also acted as a parapet to the upper gallery. The fourth story formed a continuous peristyle. The whole area for spectators was called the cavea.

The place of honour was the circle nearest to the arena, called the podium, in which sat the Emperor, senators, principal magistrates, Vestal Virgins, and the provider or “Editor” of the show. In the amphitheatre at Nîmes seats in the podium were also assigned to the various guilds, whose names are still inscribed upon the seats with the number of places reserved for each.

The principle of construction adopted in the Colosseum, as may be seen from the plan, is that of wedge-shaped piers, radiating from the arena to the exterior. These were connected by vaults which ran downward toward the centre and also in concentric rings, forming passageways to all parts of the cavea. The system is one of concrete vaulting resting on piers of the same material, the latter being reinforced by tufa where the pressure was greater and in the parts of greatest strain by blocks of travertine, four feet thick, sheathed with brick work. “The supports have been calculated at one-sixth of the whole area of the building.”

Theatre.—The form of the Roman theatre grew directly out of that of the Hellenic, but was modified to suit the change which had come over the character of drama. The religious origin of the Hellenic drama had been completely left behind. There was no longer any pretence of a chorus; accordingly the circular space of the orchestra, which had been used by it, was now filled with seats, reserved for persons of distinction. It became, in fact, that part of the auditorium which we still distinguish as the orchestra seats.

Already, in later Hellenic drama, the action of the principal players, which originally had been confined to the orchestra, had extended more and more to the slightly raised platform in front of the proskenion. It was therefore but another step to limit the action to the platform, which, now that the orchestra was filled with spectators, was raised higher from the floor, and, to accommodate the players, was made broader. The separation of the actors from the audience was complete.

The proscenium now became a background, built up to represent a façade of several stories, embellished with pilasters and engaged arches and with niches holding statues. The remains of such a permanent “scene” are found in the Theatre of Orange, in Southern France, where what we now call the stage is 203 feet wide and 45 feet deep, framed in at the ends by return walls at right angles to the proscenium. Near the top of the walls are two tiers of corbel stones, pierced to receive flag-staffs that supported the velarium.