21. External longitudinal stiffeners ran along the sides. 22. In appearance they were fairly typical Drummond family products with the stiffener across the cab roof. 23. The stiffener serves to tie the block and transmission together into a single, reinforced unit. 24. The vamp and the quarters and heel stiffener are stitched together and eyelets or fastenings attached. 25. So we've made the necessary design change by adding graphite stiffeners to the stabilizer beams. 26. Fabric stiffener is also available in craft and fabric stores and comes in a convenient spray bottle. 27. A submarine hull requires expensive transversal construction, with stiffener rings located more frequently than the longitudinals. 28. Additionally, ceresin, gum tragacanth, and methyl cellulose are regular ingredients added to act as stiffeners . 29. Often, hatch areas are reinforced by locally increasing the scantlings or by adding structural members called stiffeners . 30. Metal stiffeners were welded to each panel's interior face to provide a small degree of rigidity.
