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 construction of tenons for gates, such as entrance gates to parks or lodges, is shown by portions of two typical examples of gates (Figs. 1 and 5). The forms of the tenons, etc., are indicated by dotted lines. Figs. 2, 3, and 4 show isometric views to a larger scale of the tenons indicated at Fig. 1. Fig. 6 is an oblique projection of the joints at A (Fig. 5). When the rails are 3 1/2 in. and under, they usually have tenons the whole width; but when over 3 1/2n. and up to 6in. the tenons are diminished generally to 3 in. or 3 1/2in., having a haunch on one or both sides. When the rails are more than 6in. wide, they frequently have two tenons in breadth as illustrated. The tenons are wedged into the mortises (see Figs, l and 5), and as an additional security they are occasionally pinned as indicated at Fig. 5.

Construction of Tenons for Entrance Gates.
 
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