Our next task was to step the mast.  We found in the shed an old flagstaff 15 feet long and 3 inches in diameter.  The lower end of this, for about a foot, we whittled down to a diameter of 2 inches, and drove it into a hole in the backbone 12 inches from the forward end.  The mast was stayed by a wire stretched from the head to an eye bolt at the fore end of the backbone.  The end of the mast which projected below the backbone was stayed with wire running forward to an eye bolt and aft to a screw eye on the backbone, and also with a pair of wires running to screw eyes threaded into the crosspiece near the ends.  We couldn’t very well use eye bolts on these wires except at the fore end, but we stretched the wires as tight as possible before the screw eyes were screwed all the way in, and then, as we turned the screw eyes, the wire was wound up on them and drawn fairly taut.  Fig. 219 shows a side view of the frame, and wires marked 1 and 2 are the same as illustrated in Fig. 218, which is a top or plan view of the frame.

[Illustration:  Fig. 218.  The Frame with Wire Braces.]

Mounting the Frame on Bicycle Wheels.

We were now ready to mount the frame on the bicycle wheels.  We used only the front wheels of the bicycles with the forks in which they were journaled.  The shanks at the top of the forks were firmly driven into holes in the crosspiece near the ends.  For the steering wheel Bill took the front fork and wheel of his new bicycle, letting the shank into a hole at the stern end of the backbone.

[Illustration:  Fig. 219.  Bracing the Mast.]

The Tiller.

For a tiller we used a piece of an old rake handle.  A small hole was first drilled into the handle and the end of the stick was then split through the hole, permitting the projecting shank of the fork to be driven tightly into the hole.  The split wood was now tightly closed onto the shank by means of a bolt (see Fig. 220).  In the rubbish heap we found an old chair.  The legs were sawed off and the seat was then firmly nailed to the backbone.  The back of the chair was cut down so that it just cleared the tiller.

A “Leg-of-Mutton” Sail.

[Illustration:  Fig. 220.  The Tiller.]

[Illustration:  Fig. 221.  The Seat.]

[Illustration:  Fig. 222.  Leg-of-Mutton Sail.]

Everything was now completed but the sail.  This was a triangular or “leg-of-mutton” affair, of the dimensions given in Fig. 222.  It was made of light canvas, 30 inches wide, of which we bought 14 yards.  Out of this we took one strip 18 feet long, one 13 feet, one 8 feet, and one 3 feet long.  We had no sewing machine, and therefore had to sew the strips together by hand.  The selvedge edges of the strips were lapped over each other about an inch and then they were sewed together sailor fashion, that is, each edge was hemmed down, as shown in Fig. 223.  The strips were sewed together so that at the foot each projected at least 21 inches below the