This section is from the book "Mission Furniture: How To Make It", by Henry Haven Windsor. Also available from Amazon: Mission Furniture: How to Make It.
The porch swing shown in the illustration can be made of southern pine at a very moderate cost. It should be suspended by rustless black chains and eyebolts passing through the lower rails. If cushions are desired they can be made up quite cheaply of elastic felt covered with denim cloth.
These pieces, dressed and sanded, may be bought at the mill:
Plane and square the ends of all the rails and posts. Lay out the lap joints for the back rails and posts. Use a knife line for this and saw exactly to the line to avoid trimming with the chisel. When sawing be careful to cut exactly halfway through the thickness of each piece. In the same way make the lap joints between the front rail and posts. Have the two end rails exactly the same length and proceed to fasten the front and back posts to them, using 4-in. lag screws and washers. Bore through the posts and part way into the ends of the end rails for the lag screws.Detail of the Porch Swing
The slats are mortised 1/2 in. into the back rails, or a 3/8-in. groove may be planed in these rails, the entire distance between joints, to receive the slats. A rabbeting plane will be needed for this. The arm rests lap over the back posts and are held to them with 2-in. round-head screws. They may be fastened to the top of the front posts with round-head screws or dowel pins.
Ordinary pine flooring makes a good, tight seat, or 7/8-in. board may be used if desired. Fasten the cleats, which support the seat, to the front and back lower rails with 1-1/2-in. screws.
To bring out the beautiful grain of southern pine, stain it brown or black and finish with two coats of waterproof varnish.