Shipbuilding and Shipping Record : A Journal of Shipbuilding, Marine Engineering, Docks, Harbours and Shipping; April 18, 1918 (Classic Reprint)
Excerpt from Shipbuilding and Shipping Record: A Journal of Shipbuilding, Marine Engineering, Docks, Harbours and Shipping; April 18, 1918 Owing to the incidence of the war, and the consequent. Shortage in labour, the introduction of pneumatic tools for riveting, caulking, chipping, and hole-boring has of late become more General. When riveting by means of pneumatic hammers, the rivets may be held up by a jam-back holder-oh, or by the ordinary holding-up hammer, or by a pneumatic riveting hammer, and occasionally the bottom Shell rivets are fitted from the outside, and clenched on the inside In that case the heads of the rivets are cone-shaped to fit the counter. Sink in the plat-mg, and are held up bv a hydraulic ram. The American practice is to use double hammers, the inside one being slightly the more powerful. The rivets are hardened up aft er cooling, as in hand work, and good results are obtained by any of these methods, provided always that the surfaces are first thoroughly screwed together. The air pressure at the accumulators is usually 100 lb., supplied by pipes of steam quality, laid in trenches, to the building berths and up to and along the decks, thence by ﬂexible pipes leading to the tools. The wear and tear in the hammers and the drills is per haps on the whole not more than might be expected in high-speed percussion machines, where high speed and short stroke are essential, and it is observed mainly in the valves, rivet snaps, and pistons of the drills, but hammers frequently fail through grit and small particles of the rubber tubing entering the cylinders and choking the air holes. The wastage in the ﬂexible piping is considerable, and leakage at the couplings and the accumulation of water in the piping, especially in severe weather, calls for special attention. Electric drills are now being introduced to shipyards, and where sufficient power is already at hand, they may be readily installed; but, on the other hand, they are heavier than pneumatic tools more costly to repair, and there is always a danger of accident arising from careless handling or uncovered wires. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
- Paperback | 38 pages
- 152 x 229 x 2mm | 67g
- 17 Feb 2018
- Forgotten Books
- 22 Illustrations; Illustrations, black and white