Roman Cement
A beautiful cement, improperly called Roman, is made as follows: Calcine 3 parts of ordinary clay, and mix it with 2 parts lime; grind it to powder, and calcine again.
Twelve hundred entries from the golden age of cast metal — how bells are founded, why brass is not bronze, what a cupola melts and a core withstands — by Simpson Bolland, the trade's great teacher.
A beautiful cement, improperly called Roman, is made as follows: Calcine 3 parts of ordinary clay, and mix it with 2 parts lime; grind it to powder, and calcine again.