The drawing of a Baffin Island umiak on page 188 is based on measured dimensions of a single boat and upon a small model in the U.S. National Museum. This model conforms in most respects with the drawings and sketches made by Boas.[5] The umiak is a small one, 24 feet 7¼ inches long, 5 feet 8⅜ inches extreme beam, 3 feet 10 inches wide over the chines, and 1 foot 10½ inches deep. These measurements show that the bottom of this type of umiak is wider than that of western types. The bottom is flat, and sheer and camber are both slight. The stem and stern are practically upright and are not formed of knees; rather, they are made by fitting the post into the keelson with an open tenon. Instead of the carved block headboards seen in the Alaskan umiaks, the Baffin Island boat has very wide headboards, and these are tenoned over the posts as in the Asiatic Koryak umiaks. The details of the rest of the framing are not dissimilar from those of the Alaskan umiaks, except that the Baffin Island umiak does not employ any short frames in the end of the hull. The framework is rather heavy and the square-ended appearance of this class of umiak makes it appear more clumsy than is actually the case. The side battens and risers stop short of the posts, and the risers used in this umiak are notched into the side frames, whereas in the Alaskan umiak only the lashings of the riser are let into the frames. The Baffin Island umiaks carry a square sail lashed to a yard, and the mast is placed right up in the eyes of the boat. Boas shows that some of these umiaks have rudders hung on metal pintles and gudgeons, a result of the influence of the white traders, whalers, and sealers who had operated in these waters long before Boas made his investigations. The umiak is rowed in the usual manner, using thong loops as tholes, and is usually steered with an oar or long paddle. [5] See bibliography. The ends of the gunwales of the Baffin Island umiak are cut off a little inside the forward edges of the headboards, making this the only American type that does not have projecting gunwales at bow and stern. The projection of the gunwales undoubtedly serve a practical purpose in lifting the boat out of water, but obviously this is of minor importance. Probably the real reason for these projections is that they originally made building easier by providing space for a retaining lashing when the gunwales were being bent. As the headboards became wider and the spring of the gunwales, in plain view, became less acute, less strain was put on the lashings of the gunwales at the headboards, but by then the projecting gunwales and their retaining lashings were being utilized in lashing on the skin covering at bow and stern. Thus, beginning as a practical solution of a building problem, the projecting gunwales may have eventually become a traditional tribal feature of the umiak in many localities.