Abstract: A trip-wire guiding device for a protective fence is described including an elongated member attachable to ground-anchoring means intermediate the fence poles and formed with a plurality of openings through which the tensioned trip-wire are passed for maintaining them in parallel space relationship. Each trip-wire is insertable into the opening via a passageway extending from the opening to the edge of the member. A common locking member is received in a channel extending longitudinally through the elongated member aligned with and passing through the passageways, the common locking member being effective to lock the trip-wires in their respective opening against removal through the passageways, but permits their longitudinal movement, such as to cause the detector means to be actuated upon a change in tension in the trip-wires, but to preclude disabling the detector means by merely fastening the tensioned trip-wires to the wire-guiding member or to the common locking member fixed thereto.

Abstract: A three-dimensional digitizer for digitizing the surface contour of a solid body comprises a probe supported on the base for contacting the solid body at a plurality of sample points, a pair of mounting members mounting the probe for movement in linear directions along the X-coordinate and Y-coordinate, respectively, with respect to the base and the solid body; and a third mounting member for mounting the solid body for movement in a rotary direction with respect to the probe.