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John H. Balsley (May 29, 1823 – March 12, 1895) was a master carpenter and inventor, inventing a practical folding wooden stepladder and receiving the first U.S. patent issued for a safety stepladder in the year. He was born in Connellsville, Fayette County, Pennsylvania to George H. and Sarah (Shallenberger) Balsley. His father was also a ...
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.
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).
A pilot ladder is a highly specialized form of rope ladder, typically used on board cargo vessels [1] for the purposes of embarking and disembarking pilots. The design and construction of the ladders is tightly specified [ 2 ] by international regulation under the SOLAS regime.
Stand-off brackets: Dictated by OSHA Standard 1910.27(c)(4) stand-off brackets must be at least 7" (180 mm) longer than the farthest obstruction for clearance on the back side of ladder. This means that if there is a 4" (100 mm) gutter projecting from the side of a building, a fixed ladder would have to have standoff brackets that were at least ...
A tripod is a portable three-legged frame or stand, used as a platform for supporting the weight and maintaining the stability of some other object. The three-legged (triangular stance) design provides good stability against gravitational loads as well as horizontal shear forces , and better leverage for resisting tipping over due to lateral ...
This all began five months ago—on July 8—when I stumbled upon a strength training app called Ladder, where users join one of 17 teams to get curated progressive overload training programs that ...
Alternatives to 12ft include: [7] Private browsing for some websites, though often with access limits; Through a virtual private network, the Tor network or a proxy server; Several browser extensions [8] [9] Several archive sites, including Internet Archive and archive.today; Several web content converters, including txtify.it [10] and ...