File:Half angle block.jpg

English: An half angle block design for a Howe truss bridge. Half angle blocks can be used at the ends of a Howe truss bridge. The angle block is made of solid cast iron. One or more holes are cast through the block to provide access for the vertical posts. The chord also has a hole to accept the vertical post. The end portion of the vertical post is threaded so that a nut and washer can be screwed to the post to hold it in place. Lugs (flanges) accept the diagonal braces and diagonal counter-braces. The screws on the vertical posts are then tightened, putting the diagonals and diagonal counter-braces into compression and holding them in place against the lugs and angle block.