It was stated above that the irrigation-canals and little channels were made above the level of the soil so that the water could at any point be tapped and allowed to flow over the surrounding land; and in a flat country like Babylonia it will be obvious that some means had to be employed for raising the water from its natural level to the higher level of the land. As we should expect, reference is made in the Babylonian inscriptions to irrigation-machines, and, although their exact form and construction are not described, they must have been very similar to those employed at the present day. The modern inhabitants of Mesopotamia employ four sorts of contrivances for raising the water into their irrigation-channels; three of these are quite primitive, and are those most commonly employed. The method which gives the least trouble and which is used wherever the conditions allow is a primitive form of water-wheel. This can be used only in a river with a good current. The wheel is formed of rough boughs and branches nailed together, with spokes joining the outer rims to a roughly hewn axle. A row of rough earthenware cups or bottles are tied round the outer rim for picking up the water, and a few rough paddles are fixed so that they stick out beyond the rim. The wheel is then fixed in place near the bank of the river, its axle resting in pillars of rough masonry.
As the current turns the wheel, the bottles on the rim dip below the surface and are raised up full. At the top of the wheel is fixed a trough made by hollowing half the trunk of a date-palm, and into this the bottles pour their water, which is conducted from the trough by means of a small aqueduct into the irrigation-channel on the bank.
The convenience of the water-wheel will be obvious, for the water is raised without the labour of man or beast, and a constant supply is secured day and night so long as the current is strong enough to turn the wheel. The water can be cut off by blocking the wheel or tying it up. These wheels are most common on the Euphrates, and are usually set up where there is a slight drop in the river bed and the water runs swiftly over shallows. As the banks are very high, the wheels are necessarily huge contrivances in order to reach the level of the fields, and their very rough construction causes them to creak and groan as they turn with the current. In a convenient place in the river several of these are sometimes set up side by side, and the noise of their combined creakings can be heard from a great distance. Some idea of what one of these machines looks like can be obtained from the illustration. At Hit on the Euphrates a line of gigantic water-wheels is built across the river, and the noise they make is extraordinary.
Where there is no current to turn one of these wheels, or where the bank is too high, the water must be raised by the labour of man or beast. The commonest method, which is the one employed generally on the Tigris, is to raise it in skins, which are drawn up by horses, donkeys, or cattle. A recess with perpendicular sides is cut into the bank, and a wooden spindle on wooden struts is supported horizontally over the recess. A rope running over the spindle is fastened to the skin, while the funnel end of the skin is held up by a second rope, running over a lower spindle, until its mouth is opposite the trough into which the water is to be poured. The beasts which are employed for raising the skin are fastened to the ends of the ropes, and they get a good purchase for their pull by being driven down a short cutting or inclined plane in the bank. To get a constant flow of water, two skins are usually employed, and as one is drawn up full the other is let down empty.
The third primitive method of raising water, which is commoner in Egypt than in Mesopotamia at the present day, is the shadduf, and is worked by hand. It consists of a beam supported in the centre, at one end of which is tied a rope with a bucket or vessel for raising the water, and at the other end is fixed a counterweight.[[4]] On an Assyrian bas-relief found at Kuyunjik are representations of the shadduf in operation, two of them being used, the one above the other, to raise the water to successive levels. These were probably the contrivances usually employed by the early Babylonians for raising the water to the level of their fields, and the fact that they were light and easily removed must have made them tempting objects to the dishonest farmer. Hammurabi therefore fixed a scale of compensation to be paid to the owner by a detected thief, which varied according to the class and value of the machine he stole. The rivers and larger canals of Babylonia were used by the ancient inhabitants not only for the irrigation of their fields, but also as waterways for the transport of heavy materials. The recently published letters of Hammurabi and Abêshu’ contain directions for the transportation of corn, dates, sesame seed, and wood, which were ordered to be brought in ships to Babylon, and the code of Hammurabi refers to the transportation by water of wool and oil. It is therefore clear that at this period considerable use was made of vessels of different size for conveying supplies in bulk by water. The method by which the size of such ships and barges was reckoned was based on the amount of grain they were capable of carrying, and this was measured by the gur, the largest measure of capacity. Thus mention is made in the inscriptions of vessels of five, ten, fifteen, twenty, thirty, forty, fifty, sixty, and seventy-five gur capacity. A boat-builder’s fee for building a vessel of sixty gur was fixed at two shekels of silver, and it was proportionately less for boats of smaller capacity. To ensure that the boat-builder should not scamp his work, regulations were drawn up to fix on him the responsibility for unsound work. Thus if a boat-builder were employed to build a vessel, and he put faulty work into its construction so that it developed defects within a year of its being launched, he was obliged to strengthen and rebuild it at his own expense.
[4] The fourth class of machine for raising water employed in Mesopotamia at the present day consists of an endless chain of iron buckets running over a wheel. This is geared by means of rough wooden cogs to a horizontal wheel, the spindle of which has long poles fixed to it, to which horses or cattle are harnessed. The beasts go round in a circle and so turn the machine. The contrivance is not so primitive as the three described above, and the iron buckets are of European importation.
The hire of a boatman was fixed at six gur of corn to be paid him yearly, but it is clear that some of the larger vessels carried crews commanded by a chief boatman, or captain, whose pay was probably on a larger scale. If a man let his boat to a boatman, the latter was responsible for losing or sinking it, and he had to replace it. A boatman was also responsible for the safety of his vessel and of any goods, such as corn, wool, oil, or dates, which he had been hired to transport, and if they were sunk through his carelessness he had to make good the loss. If he succeeded in refloating the boat after it had been sunk, he was only under obligation to pay the owner half its value in compensation for the damage it had sustained. In the case of a collision between two vessels, if one was at anchor at the time, the owner of the other vessel had to pay compensation for the boat that was sunk and its cargo, the owner of the latter estimating on oath the value of what had been sunk. Boats were also employed as ferries, and they must have resembled the primitive form of ferry-boat in use at the present day, which is heavily built of huge timbers, and employed for transporting beasts as well as men across a river.