The methods used by a paddler to right a capsized kayak, without aid and while he was still in the cockpit, have aroused the interest of many canoeists. It was used by the King Islanders, some of the Aleuts, and the Greenlanders, who at times, it is said, would deliberately capsize their kayak to avoid the blow of a heavy breaking sea, then right it when the sea had passed. The Eskimo are reported to be gradually losing this skill, but in late years European and American kayakers have learned this method, called the "kayak roll," of righting a decked canoe with paddler in place. It follows in general the Greenland method. In the Appendix (p. 223) is an illustrated description of the kayak roll, supplied by John Heath. Traditionally, the weapons used by kayakers were darts and harpoons, the bow not being employed, since wetting would damage the weapon. Various forms were used, and many were thrown with the "throwing-stick" to increase the range and force. An inflated bladder or skin was often carried to buoy the harpoon line and tire the game. Bolas and knives were also carried. All eastern kayaks appear to have been propelled with the double-blade paddle, but folklore suggests that the single-blade kayak paddle may have once been used. Greenland kayaks have been reported as carrying a small square sail, but this was actually a hunting screen, or camouflage, to hide the paddler and cause the seal to mistake the canoe for a cake of ice. It was a 19th-century addition, as was a fin attached to the kayak to counteract the effect of the screen in a beam wind. Any effect it had as a sail in a kayak was unintentional, of course: it was dismounted in strong winds or when not required for hunting. [Illustration: Figure 176 KORYAK KAYAK, drawn from damaged kayak in the American Museum of Natural History, 1948.] Shown above is the plan of an Asiatic Koryak kayak. This type, used in the Sea of Okhotsk and on the Siberian coast of Bering Sea, is the only distinctive Asiatic type; the Chukchi of the Siberian side of Bering Strait uses a kayak that is on the same model as the one found at Norton Sound, in Alaska. The Chukchi kayak differs only in the ends, which are wholly functional and without the handgrips that distinguish the Alaskan type. There is also a crude Chukchi river kayak, covered with reindeer skin, but its design is not represented in an American museum.