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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.
Loft is a method to create complicated smooth 3D shapes in CAD and other 3D modeling software. Planar cross-sections of the desired shape are defined at chosen locations. Algorithms find a smooth 3D shape that fit these cross-sections. Designers can modify the shape through choice of fitting algorithm and input parameters.
Sketchpad (1963) [5] was the precursor of the computer-aided design programs, it computerized the drawing and allowed setting of parametric relationships between objects via a graphical user interface; DAC-1 (1963-1964) was a CAD-like program developed by General Motors. The first attempts to separate the CAAD from generic CAD were made in the ...
Cages are mandated to begin between 7' and 8'(2250 mm) from the ground and extend the entire length of the ladder. Cages can have left hand exits (opening in the LH side of cage), right hand exits (opening in RH side of cage), top exits (for exit through a hatch or floor door), and walk through exits (for exit through back side of fixed ladder).
A 1:1 scale construction drawing of a boat and its parts Lines plan A scaled-down version of a full-sized drawing often including the body, plan, profile, and section views Body Plan A view of the boat from both dead ahead and dead astern split in half Plan view A view looking down on the boat from above Profile view A view of the boat from the ...
A trapdoor or hatch is a sliding or hinged door that is flush with the surface of a floor, ceiling, or roof. [1] It is traditionally small in size. [ 2 ] It was invented to facilitate the hoisting of grain up through mills, however, its list of uses has grown over time. [ 3 ]