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J
jack arch one having horizontal or nearly horizontal upper and lower surfaces. Also called flat or straight arch.
joint the space between stone units, usually filled with mortar.
jointing scheme a detailed architectural drawing showing the dimensions, locations and configurations of stone units and joints on the structure.
jumper in ashlar patterns, a piece of stone of higher rise than adjacent stones which is used to end a horizontal mortar joint at the point where it is set.
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