Abstract: An automatic surface defect-detecting method and apparatus for detecting only effective significant surface defects. The significant defects can be detected from video signals and differential signals corresponding to particular scanning lines respectively by removing the distributed density portions having a larger pulse width in the scanning line direction, or removing smaller differential value portions in density, from the examined portions with higher density of flourescent magnetic powders thereon.

Abstract: A sustaining device for adjustably holding and positioning an article in space which includes a stationary member, a pair of links pivoted thereto and extending therefrom, a floating member pivoted to the outer ends of the links for movement in a vertical plane relative to the first member, a spring connected between said stationary member and said floating member to produce an upward moment to counterbalance the moment produced by the weight of the article and means coordinated with at least one of said members to equalize said moments throughout the range of vertical displacement of said article.