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  2. Factor of safety - Wikipedia

    en.wikipedia.org/wiki/Factor_of_safety

    In engineering, a factor of safety (FoS) or safety factor (SF) expresses how much stronger a system is than it needs to be for an intended load.Safety factors are often calculated using detailed analysis because comprehensive testing is impractical on many projects, such as bridges and buildings, but the structure's ability to carry a load must be determined to a reasonable accuracy.

  3. Property tax in the United States - Wikipedia

    en.wikipedia.org/wiki/Property_tax_in_the_United...

    In an apportioned land tax, each state would have its own rate of taxation sufficient to raise its pro-rata share of the total revenue to be financed by a land tax. So, for example, if State A has 5% of the population, the State A would collect and remit to the federal government such tax revenue that equals 5% of the revenue sought.

  4. Home lift - Wikipedia

    en.wikipedia.org/wiki/Home_lift

    A home lift not to be confused with a home elevator is a type of lift specifically designed for private homes, where the design takes into consideration the following four factors: 1. Compact design in view of the limitations of space in a private residence, 2. Usage of the lift restricted primarily to the residents of the private homes, 3.

  5. Permissible stress design - Wikipedia

    en.wikipedia.org/wiki/Permissible_stress_design

    The "factor" is sometimes called a factor of safety, although this is technically incorrect because the factor includes allowance for matters such as local stresses and manufacturing imperfections that are not specifically calculated; exceeding the allowable values is not considered to be good practice (i.e. is not "safe").

  6. Elevator - Wikipedia

    en.wikipedia.org/wiki/Elevator

    The safety and speed of electric elevators were significantly enhanced by Frank Sprague, who added floor control, automatic operation, acceleration control, and further safety devices. His elevator ran faster and with larger loads than hydraulic or steam elevators. 584 of Sprague's elevators were installed before he sold his company to the Otis ...

  7. Causes of the 2000s United States housing bubble - Wikipedia

    en.wikipedia.org/wiki/Causes_of_the_2000s_United...

    For example, the monthly cost of a $250,000 home at 6% interest fixed over 30 years, with 1% property taxes, 0.75% maintenance costs, and a 30% federal income tax rate is approximately $1361 per month. The rental cost for an equivalent home may be less in many U.S. cities as of 2006.

  8. Skyscraper design and construction - Wikipedia

    en.wikipedia.org/wiki/Skyscraper_design_and...

    The elevators in a skyscraper are not simply a necessary utility like running water and electricity, but are in fact closely related to the design of the whole structure. A taller building requires more elevators to service the additional floors, but the elevator shafts consume valuable floor space.

  9. Private property - Wikipedia

    en.wikipedia.org/wiki/Private_property

    A property tax is an ad valorem tax on the value of a property, usually levied on real estate. The tax is levied by the governing authority of the jurisdiction in which the property is located. It may be imposed annually or at the time of a real estate transaction, such as in real estate transfer tax.