The Indian Ocean - Michael Pearson [52]
These sails were the famous triangular lateen sails so evident even today in the Indian Ocean. The name is a misnomer, as it comes from the time of the Crusades, when western Europeans first saw them, and called them the Latin sail, from the French une voile latine. They had been used by the Arabs for some centuries before the Common Era, and were the first sails which allowed a ship to beat into the wind. As compared with European square sails, a lateen rigged ship can sail well with the wind abeam, that is 90° against the direction of travel, and even reasonably well with the wind forward of the beam, at 50° or even 60° off the bow. Some authorities say dhows tack straight across the wind as a modern yacht does, but in fact they changed course by wearing around, stern to wind, instead of tacking.16
Lateen sails are often described as a 'gift of the Arabs' to western sailors. However, Campbell claims that they developed independently in several places. Their origin may be from Persia, rather than pre-Islamic Arabia, and it could be that they reached the Mediterranean via Persia. They were found in the Mediterranean from the beginning of the Common Era, and he suggests that Arabs then learnt to use them from earlier users in both the Mediterranean and the Indian Ocean. Very similarly shaped sails evolved independently in eastern Indonesia and were used in the great voyages in the Pacific by Austronesian peoples which we mentioned in the previous chapter (page 60). Campbell claims that they are not particularly effective sails anyway, though this obviously raises the question of why they were used for so many centuries.17
To make the dhow watertight was only one reason for treating the wood. Equally important was to deter the accumulation of barnacles and other growths on the hull. Of these, the most dangerous was teredo, or shipworm, a ravenous mollusc which wreaked havoc in tropical waters. Severin described their rapid penetration. He found that if it was not treated, the timber in his replica dhow was nearly destroyed after two months. Even after this short time wormholes as big as knitting needles appeared, and one could snap with bare hands panels 2½ inches thick.18
The traditional solution was to smear the hull every two months or so with a combination of boiled animal or fish fat and crushed lime. In the absence of dry docks this required running the vessel aground, but thanks to the flexibility of the construction this could be done easily and safely. There were two processes involved. The carvel method of construction meant that resin was used to fill gaps between the planks while the boat was being built, but then the process of greasing and smearing was done routinely during the life of the vessel.
The navigator of the dhow in our period, such as the famous fifteenth century sailor Ibn Majid, was the mu'allim, who sailed the ship and was responsible for what happened on board. He checked the fitting out, stores, gear, and loading. He was in charge of the crew and passengers, looked after their safety and health and solved their quarrels. All this was laid down in the contract drawn up before the ship left. It was required to take a set number of passengers, and a set quantity of their effects. There were also bills of lading governing the cargo. His duty of care ended when he got the ship back to its home port. Ibn Majid also advised the captain to
Be quick to make a decision.... It is necessary when you sail to be clean.... Forbid all those who sail from making fun of others on the sea; it will only result in evil, hatred and enmity and he who does this continually will not be spared from grudge or hatred or contempt.... Consult other people and improve your own opinion.19
Dhows of one sort or another were the dominant form all over the western Indian Ocean. Their sizes covered a wide range, from less than 50 tons up to perhaps 500. Different sizes had different names. A major variation was the ships built