A dustiness test has been developed that performs both a single-drop and a continuous rotation test using a 6-g sample. Tests were completed on pigment-grade and ultrafine TiO2, two grades of corundum...
The trials of closure of drum perforation since a long are described. The first, who noticed drum perforation was Astley Paston Cooper. The first, who used artificial ear-drum was Marcus Banzer. The a...