Substitute materials. Timber connectors. Use of wood in the construction of Army chapels is shown here, one of 570 similar structures erected since last fall. All of them were built with wood trusses like these or with glued laminated wood arches, saving many tons of structural steel for more strategic purposes. New methods for timber joints have made it possible to reduce the amount of material needed for trusses and other load-bearing members. Sourced from the Library of Congress.