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  2. Manhole cover - Wikipedia

    en.wikipedia.org/wiki/Manhole_cover

    A round manhole cover of a given diameter has a smaller surface area than a square cover of the same width, thus less material is needed to cast the manhole cover, meaning lower cost. The bearing surfaces of manhole frames and covers are machined to assure flatness and prevent them from becoming dislodged by traffic.

  3. List of roller coaster elements - Wikipedia

    en.wikipedia.org/wiki/List_of_roller_coaster...

    A brake run on a roller coaster is any section of track that utilizes some form of brakes to slow or stop a roller coaster train.The most common type is the friction brake, often called a fin brake, which involves a series of hydraulic-powered clamps that close and squeeze metal fins that are attached to the underside of a coaster train.

  4. Category:Roller coaster elements - Wikipedia

    en.wikipedia.org/wiki/Category:Roller_coaster...

    Roller coaster elements include various elements that make up typical roller coaster circuits, such as roller coaster inversions. Pages in category "Roller coaster elements" The following 17 pages are in this category, out of 17 total.

  5. Road surface - Wikipedia

    en.wikipedia.org/wiki/Road_surface

    With break and seat and crack and seat processes, a heavy weight is dropped on the concrete to induce cracking, then a heavy roller is used to seat the resultant pieces into the subbase. The main difference between the two processes is the equipment used to break the concrete pavement and the size of the resulting pieces.

  6. Roller coaster wheel assembly - Wikipedia

    en.wikipedia.org/wiki/Roller_coaster_wheel_assembly

    On X2, also located at Six Flags Magic Mountain, the trains utilize 4 rails, rather than the usual 2, in order to rotate the seats. With this configuration, the cars have 6 wheels per assembly running on the main rails, and an additional 4 wheels per side running on the extra set of rails.

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  8. Leader head - Wikipedia

    en.wikipedia.org/wiki/Leader_Head

    Copper Leader Head at Penn's Quadrangle, Philadelphia 1894 Copper Leader at Shofuso Japanese House and Garden in Philadelphia. The purpose of a leader head is to help transfer excess water from the roof onto downspouts, thus preventing the gutters from overflowing and water washing over the walls, which is a common occurrence in areas susceptible to heavy rain cycles.

  9. Timeline of United States inventions (before 1890) - Wikipedia

    en.wikipedia.org/wiki/Timeline_of_United_States...

    Earmuffs cover a person's ears for thermal protection. Earmuffs consist of a thermoplastic or metal head-band, that fits over the top of the head, and a pad at each end, to cover the external ears. Earmuffs were invented by Chester Greenwood in 1873. [199] 1873 Silo. Two farm silos. A silo is a structure for storing bulk materials.

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