| 摘要 |
<p>In an apparatus (10) for the measurement of the thickness of a sheet (16) through the use of air bearings (38, 39) the apparatus has a stationary housing (18) a member (20) in the housing capable of being extended in a direction substantially perpendicular to the sheet, and fluid means capable of directing fluid to impinge the member in a substantially omnidirection which is substantially perpendicular to the direction of extension of the member. </p> |
