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Longer washing lines often have props holding up the mid-section so the weight of the clothing does not pull the clothesline down to the ground. More elaborate rotary washing lines save space and are typically retractable and square or triangular in shape, with multiple lines being used (such as the Hills Hoist from Australia). Some can be ...
A Hills Hoist is a height-adjustable rotary clothes line, designed to permit the compact hanging of wet clothes so that their maximum area can be exposed for wind drying by rotation. They are considered one of Australia's most recognisable icons , and are used frequently by artists as a metaphor for Australian suburbia in the 1950s and 1960s.
Gilbert Toyne's final patented rotary clothes hoist design was in 1945 "Improvements relating to hydraulic clothes hoists" (Australian Patent No. 128009) [8] Hydraulic clothes hoists used fluid as a means of raising and lowering the clothes line frame. At least seven hydraulic clothes hoists had been patented in Australia prior to Toyne's design.
Patent Model - Clothes-Pounder, 1878, [3] Hagley Museum and Library Of Colvin's four laundry improvements, her first one was the most important. It was for an improvement upon washing-machines and consisted of a rotating hollow cylinder inside a boiler which could clean a variety of fabrics including carpets and laces without rubbing and damaging them.
Schematic cross section of a pressurized caisson. In geotechnical engineering, a caisson (/ ˈ k eɪ s ən,-s ɒ n /; borrowed from French caisson 'box', from Italian cassone 'large box', an augmentative of cassa) is a watertight retaining structure [1] used, for example, to work on the foundations of a bridge pier, for the construction of a concrete dam, [2] or for the repair of ships.
The most common use for portland cement is in the production of concrete. [17] Concrete is a composite material consisting of aggregate (gravel and sand), cement, and water. As a construction material, concrete can be cast in almost any shape desired, and once hardened, can become a structural (load bearing) element.
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Power trowels differ in the way they are controlled: Ride-on power trowels have two spider/rotor assemblies and are controlled by an operator sitting on a seat upon the machine, controlling the power trowel movement with two joystick/levers (these can be either mechanical or electronic/hydraulic).