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  2. Stairs - Wikipedia

    en.wikipedia.org/wiki/Stairs

    Some building codes also specify a minimum riser height, often 5 inches (127 mm). [35] Riser-Tread formula: Sometimes the stair parameters will be something like riser plus tread equals 17–18 inches (432–457 mm); [36] another formula is 2 times riser + tread equals 24.6 inches (625 mm), the length of a stride. [13]

  3. Riser (casting) - Wikipedia

    en.wikipedia.org/wiki/Riser_(casting)

    A riser, also known as a feeder, [1] is a reservoir built into a metal casting mold to prevent cavities due to shrinkage. Most metals are less dense as a liquid than as a solid so castings shrink upon cooling, which can leave a void at the last point to solidify. Risers prevent this by providing molten metal to the casting as it solidifies, so ...

  4. Height restriction laws - Wikipedia

    en.wikipedia.org/wiki/Height_restriction_laws

    Height restriction laws are laws that restrict the maximum height of structures. There are a variety of reasons for these measures. Some restrictions serve aesthetic values, such as blending in with other housing and not obscuring important landmarks. Other restrictions may serve a practical purpose, such as height restrictions around airports ...

  5. Height of Buildings Act of 1910 - Wikipedia

    en.wikipedia.org/wiki/Height_of_Buildings_Act_of...

    Section 5 added the restriction that the height of any building would be limited to the width of the adjacent street plus 20 feet (6.1 m) up to a maximum of 90 feet (27 m) on residential streets, 130 feet (40 m) on commercial streets, and 160 feet (49 m) on a small portion of the north side of Pennsylvania Avenue between 1st and 15th Streets ...

  6. Utility pole - Wikipedia

    en.wikipedia.org/wiki/Utility_pole

    A pair of shoes can be seen hanging from the wires (center-left, far right) A utility pole is a column or post, usually made out of wood or aluminum alloy, [ 1 ] used to support overhead power lines and various other public utilities, such as electrical cable, fiber optic cable, and related equipment such as transformers and street lights.

  7. Escalator - Wikipedia

    en.wikipedia.org/wiki/Escalator

    Yellow demarcation lines are sometimes added to indicate their edges. In most escalator models manufactured after 1950, both the riser and the tread of each step is cleated (given a ribbed appearance) with comb-like protrusions that mesh with the comb plates on the top and bottom platforms and the succeeding steps in the chain.

  8. Riser card - Wikipedia

    en.wikipedia.org/wiki/Riser_card

    In servers, height for expansion cards is limited by rack units. A unit (U) is the traditional measurement used for server height. One server unit is equal to 1.75", 2U servers are 3.5", and so forth. Traditional 1U riser cards each fit 1 PCI slot, and 2U riser cards can fit 2 or 3 PCI slots, depending on whether they obstruct access to any PCI ...

  9. Tower block - Wikipedia

    en.wikipedia.org/wiki/Tower_block

    The definition of a maximum of 22 meters for the highest floor was common in the building regulations at the time and it is still so today in Germany. The common height for turntable ladders did later go to 32 meters (100 feet), so that 30 meter is a common limit in some building regulations today, for example in Switzerland.

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