金属Scaling Ladders on Market
By the use of metal in the construction of a 12-foot Pompier ladder, the Metallurgical Laboratories, Inc., of Philadelphia, has produced a ladder that weighs only seventeen pounds. The ordinary Pompier ladder of the same length weighs twenty-seven pounds. The metal ladder has resulted in a saving of thirty-seven per cent in weight.
The new ladder is entirely of steel and embodies some of the recent developments in aircraft construction. The rails and rungs are made of high grade alloy steel seamless tubing, elliptical in shape. The rungs are passed completely through the rail and are fixed in position by autogenous welding. The ends of the rungs are closed and turned up to prevent slipping. The hook is an alloy steel forging.
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