The Bark Canoes and Skin Boats of North America

by Tappan Adney; Howard Irving Chapelle

It can be seen that the exact form the canoe takes is largely a matter of judgment and of the flexibility and elasticity of the bark, rather than of precise molding on a predetermined model, or lines.

Figure 44

Details of Ribs and method of shaping them in pairs in a bark strap or thong so that they take a "set" while drying out.

In the Malecite canoe the ribs are wide amidships, 3 or 4 inches, and narrow to 2½ or 2 inches toward the ends. The thickness is an even ⅜ inch. Most birch-bark canoes have ribs of even thickness their full length, but in a few the thickness is tapered slightly above the turn of the bilge, usually when the tumble-home is high on the sides and rather great. The width, as previously explained, is usually carried all across the bottom; above the bilges there is a moderate taper.

The sheathing of the canoe is now first to be put in place. In the Malecite canoe the center pieces are the longest; they are tapered each way from their butts, which overlap about 2 inches amidships. The ends are made narrow enough to fit readily into the sharp transverse curve of the bottom and are long enough to pass under the heels of the stem pieces for an inch or two. The pieces of sheathing on each side of the center pieces are fitted in the same manner, and by the time two or three courses are in place they must be held in some manner at the ends. This is accomplished by means of the rough temporary ribs mentioned earlier. The sheathing is laid edge-to-edge, with the butts overlapping, and, if there are not enough long pieces to complete the bottom amidships, three or four lengths, with overlapped butts, will be used. As the sheathing progresses, more temporary ribs will have to be added. At the turn of the bilge, the sheathing will bend transversely as pressure is applied by the temporary ribs; the bark must be again wetted so that the angular bilge can be forced into a roughly rounded form. Particular care is required in finishing the sheathing below the gunwale to be certain that the top strake will be close up against the sewing of the bark at gunwales, but no particular attempt is made to make the edges of the sheathing in the topsides maintain edge-to-edge contact.

The pressure of the temporary ribs, the heads of which are forced under the gunwales, and the elasticity of the bark due to treating it with boiling water are enough to rough-shape the canoe.

Before the permanent ribs are placed the sheer is checked. If it appears to have straightened, the ends of the gunwales are supported by means of short posts placed under them, with the heels standing on the heels of the stem pieces or on the sheathing. Then some stakes, each having a projecting limb or root, are cut and are driven into the ground with the limb hooked over the gunwale to force it down.

After measurements have been made for the first rib with a strand of root or an ash batten, it is now cut to a length slightly more than would permit the rib to be forced upright when in place. The ends of the rib are set in place in the bevel, or notch, on the underside of the gunwales, against the bark cover, and with the bottom part of the rib standing inboard of the head. Then, with one end of a short batten placed against its inboard side, the rib is driven toward the end of the canoe with blows from a club on the head of the batten. If the rib drives too easily it is removed and laid aside; if too hard, it is shortened. It must go home tightly enough to stretch slightly the bark cover by bringing pressure to bear on the whole width of the sheathing. Care is taken, in this operation, to keep moist not only the bark but also the sewing, particularly along the gunwales, so that all possible elasticity is obtained. The ribs are set, one by one, working to within two or three frames of the midship thwart; then the other end of the canoe is begun. The last three or four ribs to be placed are thus amidships. In every rib driven, the tension is great, but no rib is driven so that it stands perpendicular to the base. Those first driven stand with their bottoms nearer the midship thwart than the ends, and this angle, or slant, continues to amidships; the ribs in the other end of the canoe slant in the opposite direction.

It will be evident that skill is required to estimate how much pressure the bark will stand before bursting under the strain of the driven ribs. It is also apparent that the shape of the canoe is controlled by the shaping given the ribs in the prebending, for this fixes the amount of tumble-home and the amount of round, or rounded-V, given to the bottom athwartships. No fixed rules appear to exist; the eye and judgment of the builder are his only guides. To show how much strain is placed on the bark, however, it may be noted that inspection of two old canoes showed that the gunwale pegs had been noticeably bent between the inner and outer gunwales.