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The Johnson–Forest Tendency, whose supporters are called the Johnsonites, was a radical left tendency in the United States associated with Marxist humanist theorists C. L. R. James and Raya Dunayevskaya, who used the pseudonyms J. R. Johnson and Freddie Forest respectively.
A stair tread is the horizontal portion of a set of stairs on which a person walks. The tread can be composed of wood, metal, plastic, or other materials. In residential settings, treads can be covered in carpeting. Stair treads can come in non-slip varieties, particularly in commercial or industrial locations. [1]
An advantage of alternating tread stairs is that people can descend while facing forward, in the direction of travel. The only other alternative in such short spaces would be a ladder, which requires a backward-facing descent. Alternating tread stairs may not be safe for small children, the elderly, or the physically challenged.
Basic Acme thread profile. The Acme thread form has a 29° thread angle with a thread height half of the pitch; the apex (or crest) and valley (or root) are flat.This shape is easier to machine (faster cutting, longer tool life) than a square thread.
A finished dovetail joint Dovetailed woodworking joints on a Romanian church Stone pillar at the Vazhappally Maha Siva Temple. A dovetail joint or simply dovetail is a joinery technique most commonly used in woodworking joinery (carpentry), including furniture, cabinets, [1] log buildings, and traditional timber framing.
Good lighting is important in a staircase so users see where they are going and to prevent falls. [6] There is often a window on the wall to let in daylight.In many cases, indoor stairs are placed far inside the building structure, and it is often not easy to get access to a wall on the outside where it would be natural to have a regular window for letting daylight in.
The Pelican Stairs next to the Prospect of Whitby pub in Wapping. Watermen's stairs were semipermanent structures that formed part of a complex transport network of public stairs, causeways and alleys in use from the 14th century to access the waters of the tidal River Thames in England.
Limestone (calcium carbonate CaCO 3) is a type of carbonate sedimentary rock which is the main source of the material lime.It is composed mostly of the minerals calcite and aragonite, which are different crystal forms of CaCO 3.