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2. Stairs - Wikipedia

   en.wikipedia.org/wiki/Stairs

   The oldest example of spiral stairs dates back to the 400s BC. [3] ... Some building codes also specify a minimum riser height, often 5 inches (127 mm). [37]

3. Make a spiral staircase by yourself in your backyard - AOL

   www.aol.com/spiral-staircase-yourself-backyard...

   This spiral staircase comes in a box, and you can put it together by yourself. Skip to main content. 24/7 Help. For premium support please call: 800-290-4726 more ways to ...

4. Fuller calculator - Wikipedia

   en.wikipedia.org/wiki/Fuller_calculator

   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.

5. Escalator - Wikipedia

   en.wikipedia.org/wiki/Escalator

   This was the first of at least four escalator-style patents issued to Souder, including two for spiral designs. [3] On March 15, 1892, Jesse W. Reno patented the "Endless Conveyor or Elevator." [4] A few months after Reno's patent was approved, George A. Wheeler patented his ideas for a more recognizable moving staircase, though it was never ...

6. Staircase - Wikipedia

   en.wikipedia.org/wiki/Staircase

   A stairwell or stair room is a room in a building where a stair is located, and is used to connect walkways between floors so that one can move in height. [1] Collectively, a set of stairs and a stairwell is referred to as a staircase or stairway. In buildings with several housing units, a stairway can be a necessary common area for getting to ...

7. List of ancient spiral stairs - Wikipedia

   en.wikipedia.org/wiki/List_of_ancient_spiral_stairs

   The spiral stair is a type of stairway which, due to its complex helical structure, has been introduced relatively late into architecture. Although the oldest example dates back to the 5th century BC, [ 1 ] it was only in the wake of the influential design of the Trajan's Column that this space-saving new type permanently caught hold in ancient ...