This section is from the book "Cassell's Cyclopaedia Of Mechanics", by Paul N. Hasluck. Also available from Amazon: Cassell's Cyclopaedia Of Mechanics.
The sketch explains how to fix a folding leaf 9 in. wide to an ordinary kitchen table and how to hinge the supports to the table top. Use the best white deal or pine both for the flap and supports. The flap should be attached to the top by means of two or three 2-in. " back-flap hinges," as shown. The supports or brackets can be made out of board of the same thickness as the flap, and shaped as shown, taking care to keep the grain of the wood horizontal, as indicated. The brackets can be fixed to the legs by two 2-in. butts. It will be noticed that the illustration shows the right-hand bracket opened out and supporting the flap, while the left-hand one is shut back ready for the flap to be dropped.

Folding Leaf and Supports for a Kitchen Table.
 
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