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A heavy duty composite paper tube. The layers of spiral-wound paper used in its construction are visible. This type of heavy tube is also used as a core for wrapping roll goods. Long corrugated box, square cross section Paperboard tubes. A shipping tube, mailing tube, or cardboard tube is a shipping container used to ship long items. It is ...
In 1964, the Board of Education authorized the construction of a 14 ft (4.3 m) diameter by 8 ft (2.4 m) high concrete block building, topped off with a rotating metal dome and retractable shutter to house the instrument. The footings and central piling were poured in early 1964, and the observatory became operational in 1965.
Cardboard is a generic term for heavy paper-based products. The construction can range from a thick paper known as paperboard to corrugated fiberboard which is made of multiple plies of material. Natural cardboards can range from grey to light brown in color, depending on the specific product; dyes, pigments, printing, and coatings are available.
The 20-by-12-foot home is constructed from cardboard paper tubes that form its structural frame, along with plywood for the floor and walls. It has a covered roof and a few windows, and sits atop ...
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 architect wanted the cardboard tubes to be the structural elements, but local manufacturers could not produce tubes thick enough and importing the cardboard was rejected. [12] The 96 tubes, reinforced with laminated wood beams, are "coated with waterproof polyurethane and flame retardants" with two-inch gaps between them so that light can ...
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