to satisfy the exacting demands of ourresearch engineers and chemists. After thoroughly exploring the asbestos-bearing districts of Canada, South Africa, Finland, Siberia and China,without finding material sufficiently pure for our requirements, ourprospectors finally found certain large deposits… … As ii k the RockbesttM tit bed, the ordinal ould I it from r I; in its r woolly si ROCKBESTOS inches or more in length. This long fibre assures for Rockbestos amechanical strength and uniformity of thickness which is necessary forthe best asbestos insulation. Rockbestos is mined in masses varying…
