Block-moulding
A device for producing thin, delicate castings, by first obtaining correct impressions in plaster of cope and nowel side of the pattern, upon which the respective parts are rammed separately in flasks which fit interchangeably. By this means all the moulds are exact impressions of the original pattern, as all danger of ramming out of shape is obviated. The match-parts and flasks being all interchangeable, there is no possibility of error. See PLATE-MOULDING; MATCH-PART.