FACTOID # 24: Looking for table makers? Head to Mississippi, with an overwhlemingly large number of employees in furniture manufacturing.
 
 Home   Encyclopedia   Statistics   States A-Z   Flags   Maps   FAQ   About 
   
 
WHAT'S NEW
RELATED ARTICLES
People who viewed "Ladder" also viewed:
 

SEARCH ALL

FACTS & STATISTICS    Advanced view

Search encyclopedia, statistics and forums:

 

 

(* = Graphable)

 

 


Encyclopedia > Ladder
A ladder
A ladder

theeweweweladder is a vertical or inclined set of rungs or steps. There are two types: rigid ladders that can be leaned against a vertical surface such as a wall, and rope ladders that are hung from the top. The vertical members of a rigid ladder are called beams (US) or stiles (UK). With a bit of agility, one can slide down the stiles without climbing down each rung. Rigid ladders are usually portable, but some types are permanently fixed to buildings. Look up ladder in Wiktionary, the free dictionary. ... Image File history File links Size of this preview: 402 × 600 pixel Image in higher resolution (429 × 640 pixel, file size: 321 KB, MIME type: image/jpeg)http://gimp-savvy. ... Image File history File links Size of this preview: 402 × 600 pixel Image in higher resolution (429 × 640 pixel, file size: 321 KB, MIME type: image/jpeg)http://gimp-savvy. ... This article is about the construction. ... A brick wall A wall is a usually solid structure that defines and sometimes protects an area. ... Coils of rope used for long-line fishing A rope (IPA: ) is a length of fibers, twisted or braided together to improve strength for pulling and connecting. ...

Contents

Variations

sketch of double extension ladder
Sketch of Cat Ladder (UK terminology) an aid when working on steep roofs.

Rigid ladders are available in many forms, such as: Image File history File links No higher resolution available. ... Image File history File links No higher resolution available. ... Image File history File links No higher resolution available. ... Image File history File links No higher resolution available. ...

  • Fixed ladder, two stiles joined by several rungs; no moving parts
  • Extension ladder, fixed ladder divided into two or more lengths for more convenient storage; the lengths can be slid together for storage or slid apart to maximize the length of the ladder; a pulley system may be fitted so that the ladder can be easily extended by an operator on the ground then locked in place using the dogs and pawls
  • Step ladder, hinged in the middle to form an inverted V, with stays to keep the two halves at a fixed angle
    • Platform steps, step ladder with small horizontal platform at the top
  • Telescopic ladder, stiles consist of short lengths of concentric tubing that can be slid inside each other for storage
  • Roof ladder, rigid ladder with large hook at the top to grip the ridge of a pitched roof
  • Cat ladder, lightweight ladder frame used on steep roofs to prevents workers from sliding
  • Hook ladder or pompier ladder, rigid ladder with a hook at the top to grip a windowsill; used by firefighters
  • Turntable ladder, extension ladder fitted to rotating platform on top of a fire truck

Rigid ladders were originally made of wood, but in the 20th century tubular aluminum became more common because of its lighter weight. Ladders with fiberglass stiles are used for working on or near overhead electrical wires, because fiberglass is an electrical insulator. Dog clutch used to drive the platter in a microwave oven. ... Pawl was a Formula One constructor (Indy 500 only) in 1951, 1954 and 1955. ... The roofs of Olomouc, Czech Republic. ... The hook ladder is a very important tool of the fire department as ou theoretically can reach evry floor of a building with it. ... A turntable ladder is the ladder on top of a fire engine wich is used by the fire brigade to rescue people from houses or to estinguish fire. ... A fire engine of the Greater Manchester Fire and Rescue Service, England. ... For other uses, see Wood (disambiguation). ... (19th century - 20th century - 21st century - more centuries) Decades: 1900s 1910s 1920s 1930s 1940s 1950s 1960s 1970s 1980s 1990s As a means of recording the passage of time, the 20th century was that century which lasted from 1901–2000 in the sense of the Gregorian calendar (1900–1999... Aluminum is a soft and lightweight metal with a dull silvery appearance, due to a thin layer of oxidation that forms quickly when it is exposed to air. ... It has been suggested that Fiber-reinforced plastic be merged into this article or section. ... This article or section is in need of attention from an expert on the subject. ...


For safety, a rigid ladder should be leaned at an angle of about fifteen degrees to the vertical. In other words, the distance from the foot of the ladder to the wall should be about one quarter of the height of the top of the ladder. At steeper angles, the ladder is at risk of toppling backwards when the climber leans away from it. At shallower angles, the ladder may lose its grip on the ground. Ladder stabilizers are available that increase the ladder's grip on the ground.


A ladder standoff, or stay, is a device fitted to the top of a ladder to hold it away from the wall. This enables the ladder to clear overhanging obstacles, such as the eaves of a roof, and increases the safe working height for a given length of ladder. The roofs of Olomouc, Czech Republic. ...

  • Rope ladders are used where storage space is extremely limited, weight must be kept to a minimum, or in instances where the object to be climbed is too curved to use a rigid ladder. They may have rigid or flexible rungs. Climbing a rope ladder requires more skill than climbing a rigid ladder, because the ladder tends to swing like a pendulum.
  • Dissipative ladders are portable ladders built to ESD (Electrostatic Discharge) standard. Electrostatic Discharge is a natural occurrence in which electricity is passed through our body, or other conductor, and discharges onto some object. For example, the shock we feel when we touch a doorknob is an ESD. This natural occurrence is becoming a very hot topic in the field of electronics assembly due to the costly damage ESDs can cause to sensitive electronic equipment. Dissipative ladders are ladders with controlled electric resistance: the resistance slows the transfer of charge from one point to another, offering increased protection during ESD events: ≥105 and < 1012 Ω / square ([e.g.][1])
  • Pool ladders. A ladder is also used on the side of a boat, to climb into it from the water, and in a swimming pool. Swimming pool ladders are usually made from plastic steps with special grip and metal bars on the sides to support the steps and as handrails for the user.

For other uses, see Pendulum (disambiguation). ... To meet Wikipedias quality standards, this article or section may require cleanup. ...

Historical usage

Ladders are an ancient tool and technology. A ladder is depicted in a Mesolithic rock painting that is at least 10,000 years old, depicted in a cave in Valencia, Spain. Bee Wilson (2004: p.5) references the rock painting which shows two naked humans carrying baskets or bags that are employing a long wobbly ladder, which appears to be made out of some kind of grass, to reach a wild honeybee nest to harvest honey. The Mesolithic (Greek mesos=middle and lithos=stone or the Middle Stone Age[1]) was a period in the development of human technology between the Paleolithic and Neolithic periods of the Stone Age. ... Location Coordinates : Time Zone : CET (GMT +1) - summer: CEST (GMT +2) General information Native name València (Valencian) Spanish name Valencia Founded 137 BC Postal code 46000-46080 Website http://www. ... Species Apis andreniformis Apis cerana, or eastern honey bee Apis dorsata, or giant honey bee Apis florea Apis koschevnikovi Apis laboriosa Apis mellifera, or western honey bee Apis nigrocincta Apis nuluensis Honey bees are a subset of bees which represent a far smaller fraction of bee diversity than most people... For other uses, see Honey (disambiguation). ...


See also

For the SUV vehicle, see Cadillac Escalade. ... Spiral (double helix) stairway in the Vatican Museum Stairs, staircase, stairway, stairwell, and flight of stairs are all names for a construction designed to bridge a large vertical distance by dividing it into smaller vertical distances, called steps. ...

References

  • Wilson, Bee (2004). The Hive: The Story Of The Honeybee. London, Great Britain: John Murray (Publishers). ISBN 0 7195 6598 7

External links


  Results from FactBites:
 
ladder (764 words)
The bed ladder of the aerial was raised by cranking a long screw which forced up the ladder.
Also, the aerial ladder was probably not raised pneumatically, but rather had a spring-assist to raise the bed ladder.
Ladder 1 was being used in front of central station to drill in 1926.
Ladder - Wikipedia, the free encyclopedia (598 words)
Ladders with fiberglass stiles are used for working on or near overhead electrical wires, because fibreglass is an electrical insulator.
This enables the ladder to clear overhanging obstacles such as the eaves of a roof, and increases the safe working height for a given length of ladder.
A ladder is also used on the side of a boat, to climb into it from the water, and in a swimming pool.
  More results at FactBites »

 
 

COMMENTARY     


Share your thoughts, questions and commentary here
Your name
Your comments

Want to know more?
Search encyclopedia, statistics and forums:

 


Press Releases |  Feeds | Contact
The Wikipedia article included on this page is licensed under the GFDL.
Images may be subject to relevant owners' copyright.
All other elements are (c) copyright NationMaster.com 2003-5. All Rights Reserved.
Usage implies agreement with terms, 1022, m