This section is from the book "Woodwork Joints", by William Fairham. Also available from Amazon: Woodwork joints.
Fig. 243 is a sketch of a small table with the top removed. A revolving fly rail is shown pivoted upon a piece of 1⁄4-in. wire. The object of this fly rail is to form a support to the small hinged drop-leaf of the table. This method is suitable for small occasional tables and similar articles.

Fig. 243. - Revolving Fly Rail for Table. See Pivoted Fly or Front Rail.
 
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