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A portcullis (from Old French porte coleice 'sliding gate') is a heavy, vertically closing gate typically found in medieval fortifications. [1] A portcullis gate is constructed of a latticed grille , made of wood or metal or both, which slides down grooves inset within each jamb of the gateway.
A wicket gate is also used for a stand-alone gate that provides convenient secondary access, for example to the rear of a walled park or garden. The cricket term "wicket" comes from this usage. [7] "The Wicket Gate" is an important feature in John Bunyan's 17th-century Christian allegory The Pilgrim's Progress. As the first stage of the journey ...
Slip gate pier with unusual groove shapes. Slip gate pier with notches for gate spars. Quite apart from the farmers own needs for movement of stock, machines and people between fields and access from roads, lanes etc. it was also a requirement for those using rights of way that gates and stiles whilst being stock proof do not "..present troublesome hindrances to passage." [7] The width of the ...
Nikkō Tōshō-gū's omote-mon (front gate) structurally is a hakkyakumon (eight-legged gate). Mon (門, gate) is a generic Japanese term for gate often used, either alone or as a suffix, in referring to the many gates used by Buddhist temples, Shinto shrines and traditional-style buildings and castles.
Tainter gates are usually controlled from above with a chain/gearbox/electric motor assembly. A critical factor in Tainter gate design is the amount of stress transferred from the skinplate through the radial arms and to the trunnion, with calculations pertaining to the resulting friction encountered when raising or lowering the gate. Some ...
Poles believed to have supported wooden bird figures very similar to the sotdae have been found together with wooden birds, and are believed by some historians to have somehow evolved into today's torii. [10] Intriguingly, in both Korea and Japan single poles represent deities (kami in the case of Japan) and hashira (柱, pole) is the counter ...
A logic circuit diagram for a 4-bit carry lookahead binary adder design using only the AND, OR, and XOR logic gates.. A logic gate is a device that performs a Boolean function, a logical operation performed on one or more binary inputs that produces a single binary output.
Principal Parisian city gates. While Paris is encircled by the Boulevard Périphérique (Paris ring road), the city gates of Paris (French: portes de Paris) are the access points to the city for pedestrians and other road users. As Paris has had successive ring roads through the centuries, city gates are found inside the modern-day Paris.