| 摘要 |
<p>Disclosed is a method and apparatus for measuring the drop Y of sports netting (10) strung between opposed posts (14, 16), wherein a datum point (28) is provided on each post, a datum line (42) is provided between the datum points and the distance Y between the datum line and a specified part (38) of the net measured; the height X above ground (40) of the net is extrapolated by providing the datum points (28) at a known height Z above ground (40) and subtracting the measured drop Y from the datum point height Z: the datum line (42) may be a light-weight cord strung between the datum points or a beam of visible or invisible light.</p> |
