[2] The double punch truss appeared in Central Europe during the Renaissance.

[3] A queen-post bridge has two uprights, placed about one-third of the way from each end of the truss.

They are connected across the top by a beam and use a diagonal brace between the outer edges.

The central square between the two verticals is either unbraced (on shorter spans), or has one or two diagonal braces for rigidity.

A single diagonal reaches between opposite corners; two diagonal braces may either reach from the bottom of each upright post to the center of the upper beam, or form a corner-to-corner "X" inside the square.