Tap-cinder
See MILL-CINDER.
Taper is draught given to patterns and models to make their withdrawal from the sand easier. In other words, the lowest parts of a pattern are made smaller in dimensions than the upper, in order that a gradually increasing clearance shall occur as the pattern is being drawn from the sand. This not only minimizes the damage to the mould, but to pattern also; the straining and rapping being always in proportion to the amount of taper given. See DRAUGHT.