. Farrow's manual of military training . BARREL PIERS,ing to avoid injuring the ropes by chafing on the ground. Therafts so formed may be united into larger ones. Where timber is available the best method of forming abarrel pier is to make an inverted box crib of lumber or timbersnailed, bolted, or lashed together. If the crib is as strong as itshould be, it may be inverted over the barrels, which will requireno other fastenings. BRIDGES AND PONTOONS 631 Raft Piers.—Rafts of timber may be used for floating pierswhen other materials are not at hand. They are durable if not dis-turbed and secure
. Farrow's manual of military training . BARREL PIERS,ing to avoid injuring the ropes by chafing on the ground. Therafts so formed may be united into larger ones. Where timber is available the best method of forming abarrel pier is to make an inverted box crib of lumber or timbersnailed, bolted, or lashed together. If the crib is as strong as itshould be, it may be inverted over the barrels, which will requireno other fastenings. BRIDGES AND PONTOONS 631 Raft Piers.—Rafts of timber may be used for floating pierswhen other materials are not at hand. They are durable if not dis-turbed and secure against being sunk by hostile fire. Their defectsare comparatively small and decreasing buoyancy, great weightand bulk. Construction of rafts is done in the water if possible. Ar-range the logs side by side to form upstream. The upstream endsshould be beveled on the lower side. The logs are held togetherby cross timbers pinned or spiked over the tops. Where the logsare of small size additional sticks may be placed in the intervalsbet
Size: 2595px × 963px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1920, booksubjectmilitaryartandscienc
