OCR Text |
Show Perfection of Cement. In Gormany puzzuolanl comont Is now n well recognized trado product, with a good reputation for its properties proper-ties of strength nnd hardness. This coment Is produced by grinding and thoroughly mixing 5 per cent granu-atod granu-atod slag with 15 por cont of llrao hydrato. Slag han also been employed lu Gormany largoly by tho Portland cement manufacturers as a substitute for-marl and llmostono, and tho claims that coment mado With this addition Is strongor than tho ordinary comont havo now been recognized by omlnont authorities. London Engine"" I |