Abstract
Five kinds of markers having the same thickness of 0.75 mm and different radii of curvature were employed in the experiment. The depths of marks on several pieces of the same kind of silk cloths by a marker under different pressures and different numbers of repetitibn were measured by a special microscope. The following results were obtained.
(1) The depths of the marks made by the markers with a small radius of curvature are generally great. The depths of marks made by the markers with a radius of curvature of 15 mm are greater by 10-40% than those made by the markers with a radius of curvature of 30 mm.
(2) The depths of the depressions made by the markers are revealed when exermined with the special microscope to be seven times greater than when exermined with the dial gauge, because the raised surface on the both sides of the dint is revealed more accurately by the microscope than by the dial gauge.
