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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 ...
Models are generally classified by the length of their box, which ranges from 8 feet (2.4 m) to 16 feet (4.9 m). When opened, the length is roughly double the box length. Most pop-ups are between 7 feet (2.1 m) and 7 feet 6 inches (2.29 m) in width and between 4 feet 6 inches (1.37 m) and 5 feet (1.5 m) in height when closed, but "high wall ...
Step stools are halfway between a ladder and a stool, being used, as a support platform, for reaching targets that are at heights between approximately 2 and 3 metres (6.6 and 9.8 ft). The most common modern type is made with two separate ladders connected to each other at the upper end, where there is a platform with an area big enough to ...
An attic ladder (US) or loft ladder (UK) is a retractable ladder that is installed into an attic door/access panel. They are used as an inexpensive and compact alternative to having a stairway that ascends to the attic of a building. They are useful in areas with space constraints that would hinder the installation of a standard staircase.
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.
The Immovable Ladder is a wooden ladder leaning against a window of the Church of the Holy Sepulchre in the Old City of Jerusalem, protected from removal or alteration under the law of the Status Quo. The ladder rests on a ledge and is attached to the right window of the second tier of the facade, owned by the Armenian Apostolic Church.