This section is from the book "The Scientific American Boy", by A. Russell Bond. Also available from Amazon: The Scientific American Boy.
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.
 
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