When once the principle had been established, by which additional power could be gained without increasing the length of the vessel, and had been tested by practical experience, its development was sure to follow. What century witnessed the birth of the trireme is not certain, but probably by 800 b.c. the earliest vessels of this description had been launched. The quick-witted sharp-eyed Greek was not slow to copy, and by the beginning of the next century the busy shipwrights of Corinth were building the new craft for Samians as well as for themselves.
It is, however, in the Attic trireme such as composed the fleets of Phormio and Conon that historical interest has centred, and though quinqueremes were commonly in use in the second and third centuries, b.c., and even still larger rates of war vessels constructed till they were inhabilis prope magnitudinis, unwieldy leviathans, such as the sixteen-banked flagship of Demetrius Poliorcetes, yet the interest in the trireme has never failed, and the splendour of its achievements has insured to it an attention on the part of the learned which no other class of vessel has been able to attract to itself. The problem of construction of the trireme, and of the method of its propulsion, has exercised the ingenuity of scholars ever since the revival of letters. It has a literature of its own, and it may fairly be said that if the enigma has not been solved, it is not for want of industry or acumen.
One point we may as well make clear at once, viz., that whatever was the vessel the ancients invariably went upon the principle, One man, one oar. Volumes have been wasted in attempts to prove that the arrangement of the ancient galleys with respect to propulsion were identical with, or very similar to, those of the mediæval galleys of Genoa or Venice. But the mediæval galleys were essentially monocrota, or one-banked vessels, though they may have been double-banked or treble-banked in the sense that two or three men were employed upon one oar.
BAS-RELIEF OF ANCIENT GREEK ROWING BOAT.
Another distinction that it is necessary to note with reference to the ancient galleys is that they were called Aphract or Kataphract according as the upper tier of rowers was unprotected and exposed to view, or fenced in by a bulwark stout enough to protect them from the enemy’s missiles. The system of side planking is observable as already adopted in some of the Egyptian vessels, though of the Greeks the Thasians are credited with the invention.
In the year 1834, during the process of excavating some ground for new public buildings in the Piræus near Athens, some engraved stone slabs were found built up in a low wall which had been uncovered. These were happily preserved and deciphered, and were found to be records of the dockyard authorities of the Athenian admiralty in the second and third centuries before Christ. Many interesting details were thus brought to light which were set in order by the illustrious scholar Boeckh in his volume entitled ‘Urkunden über das Seewesen des attischen Staates.’ His pupil Dr. Graser has carried on his researches by the examination of innumerable coins, vases, etc., and has rescued the subject from much of the obscurity which enveloped it. The following description of the trireme, based upon his labours, is quoted, by permission, from the new edition of the ‘Encyclopædia Britannica,’ vol. xxi. pp. 806, 807.
In describing the trireme it will be convenient to deal first with the disposition of the rowers and subsequently with the construction of the vessel itself. The object of arranging the oars in banks was to economise horizontal space and to obtain an increase in the number of oars without having to lengthen the vessel. We know from Vitruvius that the ‘interscalmium,’ or space horizontally measured from oar to oar, was two cubits. This is exactly borne out by the proportions of an Attic aphract trireme, as shown on a fragment of a bas-relief found in the Acropolis. The rowers in all classes of banked vessels sat in the same vertical plane, the seats ascending in a line obliquely towards the stern of the vessel. Thus in a trireme the thranite, or oarsman of the highest bank, was nearest the stern of the set of three to which he belonged. Next behind him and somewhat below him sat his zygite, or oarsman of the second bank; and next below and behind the zygite sat the thalamite, or oarsman of the lowest bank. The vertical distance between these seats was 2 feet, the horizontal distance about 1 foot. The horizontal distance, it is well to repeat, between each seat in the same bank was 3 feet (the seat itself about 9 inches broad). Each man had a resting-place for his feet, somewhat wide apart, fixed to the bench of the man on the row next below and in front of him. In rowing, the upper hand, as is shown in most of the representations which remain, was held with the palm turned inwards towards the body. This is accounted for by the angle at which the oar was worked. The lowest rank used the shortest oars, and the difference of the length of the oars on board was caused by the curvature of the ship’s side. Thus, looked at from within, the rowers amidship seemed to be using the longest oars, but outside the vessel, as we are expressly told, all the oar-blades of the same bank took the water in the same longitudinal line. The lowest or thalamite oar-ports were 3 feet, the zygite 41⁄4 feet, the thranite 51⁄2 feet above the water. Each oar-port was protected by an ascoma or leather bag, which fitted over the oar, closing the aperture against the wash of the sea without impeding the action of the oar. The oar was tied by a thong, against which it was probably rowed, which itself was attached to a thowl (σκαλμός). The port-hole was probably oval in shape (the Egyptian and Assyrian pictures show an oblong). We know that it was large enough for a man’s head to be thrust through it.