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Winders: Winders are steps that are narrower on one side than the other. They are used to change the direction of the stairs without landings. A series of winders form a circular or helical stairway. When three steps are used to turn a 90° corner, the middle step is called a kite winder as a kite-shaped quadrilateral.
A stair tread is the horizontal portion of a set of stairs on which a person walks. The tread can be composed of wood, metal, plastic, or other materials. In residential settings, treads can be covered in carpeting. Stair treads can come in non-slip varieties, particularly in commercial or industrial locations. [1]
A chapi-chapi constructed from broom sticks and plastic sheet from a discarded plastic bag, on top of other kites. Chapi-chapi is a small two-stick kite that can be quickly constructed from cheap materials such as newspapers, broom sticks, or discarded plastic sheet. It is very popular in the Philippines.
An imperial staircase (sometimes erroneously known as a "double staircase") is the name given to a staircase with divided flights. Usually the first flight rises to a half-landing and then divides into two symmetrical flights both rising with an equal number of steps and turns to the next floor .
This is a list of calculators produced by Clive Sinclair's company Sinclair Radionics: Sinclair Cambridge. Sinclair Cambridge Scientific; Sinclair Cambridge Memory;
The combination stair is a T-shaped compromise design popular in the nineteenth century that was found in some moderate-sized houses. [1] In this design, both the formal front stair and the utilitarian back stair ran to a common intermediate landing. [2] One common stair then extended from this intermediate landing to the second floor of the house.
The Fuller calculator, sometimes called Fuller's cylindrical slide rule, is a cylindrical slide rule with a helical main scale taking 50 turns around the cylinder. This creates an instrument of considerable precision – it is equivalent to a traditional slide rule 25.40 metres (1,000 inches) long.
Dopero or Double Pearson Roller Kites Double-kite systems Two coupled kites, but confined; or two coupled kites in free flight in the same (air-only or water-only, for example) or different media (air and water, for example). [129] An example is kite-surfing with a board as a hybrid water kite, coupled with a power air kite.