Telescoping in mechanics describes the movement of one part sliding out from another, lengthening an object (such as a

telescope A telescope is a device used to observe distant objects by their emission, Absorption (electromagnetic radiation), absorption, or Reflection (physics), reflection of electromagnetic radiation. Originally, it was an optical instrument using len ...

or the lift arm of an aerial work platform) from its rest state. In modern equipment this can be achieved by a

hydraulics Hydraulics () is a technology and applied science using engineering, chemistry, and other sciences involving the mechanical properties and use of liquids. At a very basic level, hydraulics is the liquid counterpart of pneumatics, which concer ...

, but pulleys are generally used for simpler designs such as extendable

ladders A ladder is a Vertical direction, vertical or inclined set of rungs or Step (footing), steps commonly used for climbing or descending. There are two types: rigid ladders that are self-supporting or that may be leaned against a vertical surface ...

and

amateur radio Amateur radio, also known as ham radio, is the use of the radio frequency radio spectrum, spectrum for purposes of non-commercial exchange of messages, wireless experimentation, self-training, private recreation, radiosport, contesting, and emer ...

antennas.

References

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See also

References