This section is from the book "The Scientific American Boy", by A. Russell Bond. Also available from Amazon: The Scientific American Boy.
We planned to use our canoe as a sailboat, and had to provide a deep keel, which, for convenience, was made detachable. This keel was 6 inches wide, 1/2 inch thick and 6 feet long, and was fastened at the center of the canoe. Screw eyes about twelve inches apart were threaded alternately into opposite sides of the keel plate. Corresponding hooks were attached to the keel in position to hook into the screw eyes, and thus hold the keel firmly in place.

Fig. 115. Bottom of Canoe, Showing Deep Keel.
 
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