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Throughout the 1930s and 1940s a wide range of fire engines, including articulated ladder trucks were made, with power coming mostly from Hercules or Waukesha engines. Pirsch first introduced aerial ladders in the 1930s, including the first fully powered 100–foot aerial ladder device in the United States in 1935.
Telescoping in mechanics describes the movement of one part sliding out from another, lengthening an object (such as a telescope or the lift arm of an aerial work platform) from its rest state. [1] In modern equipment this can be achieved by a hydraulics , but pulleys are generally used for simpler designs such as extendable ladders and amateur ...
Many shingle installations benefit from being placed on top of an underlayment material such as asphalt felt paper to prevent leaks even from wind driven rain and snow and ice dams in cold climates. At the ridge the shingles on one side of the roof simply extend past the ridge or there is a ridge cap consisting of boards, copper, or lead sheeting.
The water ladder was built as an alternative to the paddle wheel to get around the problem that to lift water to a greater height, a bigger wheel is needed. [1] Despite the emergence of new pumps that operate on other principles, the water ladder remains an important tool as some of its other benefits are that they can be built and repaired easily at a very low cost.
Hoist atop an elevator. A hoist is a device used for lifting or lowering a load by means of a drum or lift-wheel around which rope or chain wraps. It may be manually operated, electrically or pneumatically driven and may use chain, fiber or wire rope as its lifting medium.
A shingle weaver (US) or shingler [1] (UK) is an employee of a wood products mill who engages in the creation of wooden roofing shingles or the closely related product known as "shakes." [ 2 ] In the Pacific Northwest region of the United States, historically the leading producer of this product, such shingles are generally made of Western Red ...
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