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Engineering Dictionary

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An alphabetical listing of General terms and items.

 
Yagura   Dico Tools
A wall tower built a top the ishigaki which were used by defenders to protect the walls of a Japanese castle. There were four main types and they are as follows


Yagura Mon   Dico Tools
A two story gatehouse of a Japanese castle. The gateway passed through the first floor, while the second story housed the guard room and the defensive positions used by defenders to protect the gateway. This type of gatehouse was usually constituted a part of a masugata mon, forming one side of a barbican, adjacent to the krai mon. See mon, yagura.


Yamajiro   Dico Tools
A Japanese castle which was usually built on a mountain top or some other elevated position, constructed using walls of rocks and earth to reinforce the natural defences of the site, a moat was optional. This form of castle was the favoured form prior to the latter half of the 16th century, were the lessening of civil strife began to show an effect. See hirijiro, hirayamajiro. (J. mountain castle).


Yang-ma-cheng   Dico Tools
The outermost walls of a Chinese fortification of the Sung dynasty. (Chinese. Walls for sheep and horses)


Yang-ma-cheng   Dico Tools
The outermost walls of a Chinese fortification of the Sung dynasty. (Chinese. Walls for sheep and horses)


Yasama   Dico Tools
An arrow slit common to Japanese castles, consisting of a narrow opening set in a defensive position in a tower or a plastered wall. The slit was splayed on the inside and narrow at the exterior, to allow the defenders a larger field of fire and to protect them from incoming fire.


Yett   Dico Tools
An open-work iron grill suspended on hinges, placed on the inside of the wooden door of a main entrance to a tower; used as a secondary defence of the entrance.


Young's Modulus   Dico Tools
Young's Modulus (the Modulus of Elasticity) is equivalent to the ratio of normal stress to strain.



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