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An extension ladder. A ladder is a vertical or inclined set of rungs or 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 such as a wall, and rollable ladders, such as those made of rope or aluminium, that may be hung from the top.
A pilot ladder has specific regulations on step size, spacing and the use of spreaders. It is the use of spreaders (long treads that extend well past the vertical ropes) in a pilot ladder that distinguishes it from a Jacob's ladder. When not being used, the ladder is stowed away, usually rolled up, rather than left hanging.
The initial setting operation includes fixing the theodolite on a tripod, along with approximate levelling and centering over the station mark.For setting up the instrument, the tripod is placed over the station with its legs widely spread so that the centre of the tripod head lies above the station point and its head approximately level (by eye estimation).
Today's NYT Connections puzzle for Sunday, December 15, 2024The New York Times
Dr. Thomas O’Brien and his wife Ruth Reardon O’Brien, the parents of late night comedian Conan O’Brien, have died three days apart. Thomas was 95 and Ruth was 92. The couple were married 66 ...
This page was last edited on 18 July 2020, at 11:41 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may ...
Updated December 12, 2024 at 12:41 PM WASHINGTON – President-elect Donald Trump praised Elon Musk and other members of his incoming administration early Thursday after ringing the opening bell ...
The ladders are made by threading and fixing a series of hardwood, machined steps, each not more than 400 mm × 115 mm × 25 mm (15.75 in × 4.53 in × 0.98 in), onto two pairs of minimum 18 mm (0.71 in) diameter manila ropes, and binding each step to the ropes at 310 mm (12 in) (+- 5 mm, 0.20 in) intervals.
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23625 US-23, Circleville, OH · Directions · (740) 474-3874