| 摘要 |
A method of measuring surface hardness combining the techniques of Brinell Hardness testing and air-gauging by providing a hard penetrator member having in it a passage and apertures through which air under pressure is passed. The hardness of a work piece is measured by measuring the effect on air pressure caused by occlusion of the apertures as the penetrator is pressed into a specimen of which the hardness is to be measured. |
