| 摘要 |
<p>An apparatus for determining the profile of a longitudinal portion of an elongate member such as a railway rail comprising a base frame (1), an arm (6) mounted on said base frame for privotal movement relative thereto about a fixed axis (21), the base frame being capable of being releasably secured to the elongate member with the pivot axis of the arm in a plane substantially parallel to the direction of elongation of the elongate member and inclined to said direction of elongation. The arm (6) has or is adapted to have secured thereto a ranging device (3) having a ranging line (22) so that when the ranging device is fitted said ranging line (22) intersects the pivot axis (21) of the arm within the portion (42) of the elongate member that the profile is to be determined.</p> |
