抄録
There have been ardent requirements for reducing troubles of bricklaying and repairing of cupola linings. New type of patching material was made of coarse Quarzite grain and fine Pyrophyllite grain. Reduction of 1⁄3 of labour and time and good results were obtained by practical use. Specimens of used patching material were tested by microscope, Spectral analysis and X-ray diffraction patterns.
